Light Meter Research Articles

Comparison of Using Android-based Lux Meter and Split Flux Method in Natural Lighting Material in Building Physics Course

Background: The use of learning media is very influential in the learning process. In natural lighting calculation material, students usually use the Split Flux method, but the calculation is long because students have to provide a solar arc in the form of a printout on mica. So in this study, students will be divided into several groups to calculate natural lighting using an android-based lux meter.Methods: The approach used in this research is a quantitative approach, with an empiricist paradigm, and with a survey method. The survey was conducted on students who had taken the Building Physics course. The survey was conducted using an instrument. The instrument is an open and closed questionnaire.Results: The survey results show that (1) 73% of respondents chose the answer 51% to 75%, meaning that 73% of students understand the split flux method and 28% of respondents chose 75% to 100%, meaning that 28% of students understand the split flux method; (2) 78% stated that it was easier to use an android-based lux meter to measure natural lighting; (3) 79% stated that it was faster to use an android-based lux meter to measure natural lighting.Conclusion: By using an android-based lux meter, students can install it on their respective handphone, besides students are facilitated in measuring natural or artificial lighting and are not paid, besides that the process is faster and more flexible by using the help of android-based lux meter media in Building Physics courses, students become more interested in learning natural lighting measurements because they can easily take lighting measurements in a room.

Effect of Temperature and Sunlight Intensity on Surface of Solar Panels on Electric Power Generated

An alternate power generation method that uses solar energy absorption is the solar panel system. Temperature, sunshine intensity, and environmental weather all have an impact on the voltage, current, and electrical power produced by solar cells. The purpose of this study is to determine the effect of changes in temperature and light intensity from the sun on the surface of the 120 Wp solar panel used on the electrical power generated. The tools utilized are a 120 watt power supply, solder, digital thermometer, lux meter, and multimeter. The findings demonstrated a clear relationship between the amount of electricity generated and the solar panel’s surface temperature as well as light intensity. The more light intensity detected and the higher the temperature, the more electric power produced. The weather has a big impact on both temperature and light intensity. The temperature and light intensity on the surface of the solar panel increase with increasing sun exposure.

Revising normative standards for personal noise dosimeters

Personal noise dosimeters are designed to monitor noisy environments and are usually intended to attached to an individual person in order to estimate their exposure to noise over a given period of time. These devices are often used to indicate sound exposure as a percentage of a predetermined criterion. However, different jurisdictions employ different definitions of such quantities and different criteria for permissible exposure. Therefore, existing normative standards for measurement instruments differ in their specifications. For example, while the ASA/ANSI S1.25 standard Specification for Personal Noise Dosimeters makes provisions for use of three level-time exchange rates (3, 4, and 5 dB per doubling of exposure time), the international standard for personal sound exposure meters (IEC 61252) permits only an exchange rate of 3 dB. The International Electrotechnical Commission is revising IEC 61252 to modernize and harmonize requirements for the instruments to reflect the actual practice of measurements of noise exposure worldwide. The technical aims of the revision are to provide realistic specifications, consistent methods for testing all relevant characteristics of a model of instrument, and affordable methods for periodic testing of individual instruments. Potential consequences of the likely changes to IEC 61252 are presented and discussed.

Associations of light exposure patterns with sleep among Dutch children: The ABCD cohort study.

Light exposure affects the circadian system and consequently can affect sleep quality. Only few studies examined this relationship in children. We evaluated associations between light exposure patterns and sleep metrics in children. We measured the sleep parameters of 247 Dutch children, aged between 11 and 13 years and recruited from the ABCD cohort, using actigraphy and sleep records for 7 consecutive nights. Personal light exposures were measured with a light meter during the whole day and night. We applied generalized mixed-effects regression models, adjusted for possible confounders, to evaluate the associations of light exposure patterns on sleep duration, sleep efficiency and sleep-onset delay. In the models mutually adjusted for potential confounders, we found the amount of hours between the first time of bright light in the morning and going to sleep and the duration of bright light to be significantly associated with decreased sleep duration (in min; β: -2.02 [95% confidence interval: -3.84, -0.25], β: -8.39 [95% confidence interval: -16.70, -0.07], respectively) and with shorter sleep-onset delay (odds ratio: 0.88 [95% confidence interval: 0.80, 0.97], odds ratio: 0.40 [95% confidence interval: 0.19, 0.87], respectively). Increased light intensities at night were associated with decreased sleep duration (T2 β: -8.54 [95% confidence interval: -16.88, -0.20], T3 β: -14.83 [95% confidence interval: -28.04, -1.62]), while increased light intensities before going to bed were associated with prolonged sleep onset (odds ratio: 4.02 [95% confidence interval: 2.09, 7.73]). These findings further suggest that children may be able to influence their sleep quality by influencing the light exposure patterns during day and night.

Audit Dan Peluang Penghematan Energi Listrik CV Tirta Windu Agung 3 Probolinggo

The use of electrical energy in the building and industrial sectors is very important, especially the use and allocation of funds spent is quite large. So it is necessary to use energy as efficiently as possible. So there is a need for an energy audit to determine the level of electrical energy consumption used, where the results will be compared with predetermined standards. This research was carried out at CV Tirta Windu Agung 3 using a PM5100 and lux meter. From initial audit calculations, the IKE value was found to be 13.42 kWh/m2/year. This IKE value is the total of the buildings and ponds. The IKE value still includes very efficient criteria. Based on the results of detailed audit calculations, the value obtained before improvement was 2.23 kWh/m2/year. The IKE value still includes the criteria for being very efficient or meeting standards. After improvements it became 1.65 kWh/m2/year. Energy saving opportunities are available in indoor and outdoor lighting systems by replacing CFL (compact fluorescent lamp) lamps with Philips LED lamps. Based on calculations, the savings in electrical energy costs are IDR 41,736/day, resulting in savings of IDR 15,233,640/year. Based on the Isc/IL calculation above, it can be seen that the Isc/IL value is 165.4. According to the IEEE 519-2014 standard, the ISC IL value in the range >1000 has a permissible THDi value limit of 15%. The nominal voltage used is 0.4 kV, so the permitted THDv is 8%. Based on table 3.9 THDv and THDi under standard conditions.

Daily light exposure profiles and the association with objective sleep quality in patients with Parkinson's disease: The PHASE study.

Light information crucially influences sleep initiation and continuity. The purpose of this study was to compare daily light exposure between patients with Parkinson's disease (PD) and non-PD older adults and evaluate the association of daily light exposure with objective sleep measures in patients with PD. In this cross-sectional study of 189 outpatients with PD and 1101 community-dwelling older adults (controls), daily light exposure was measured using wrist light meters during the daytime and light meters set in the bedrooms during the nighttime, and objective sleep quality was measured by wrist actigraphy. The median duration of exposure to ≥ 1000 lux light was significantly shorter in patients with PD than in controls. The median nighttime light intensity was higher in patients with PD than in controls. Among patients with PD, multivariable analysis suggested that the highest quartile of exposure to ≥ 1000 lux light during the daytime was linked to significantly higher sleep efficiency (SE) by 8.0% and shorter wake after sleep onset (WASO) by 36.9 minutes than the lowest quartile. During the nighttime, the highest quartile of mean light intensity had significantly lower SE by 6.8%, longer WASO by 24.1 minutes, longer sleep onset latency, and higher fragmentation index, than the lowest quartile. Importantly, daytime and nighttime light levels were independently associated with objective sleep measures. The present study illustrated that greater daytime light exposure and lower nighttime light exposure are significantly associated with better objective sleep measures in patients with PD.

Effect of Distance between Double Glazing on the Performance of a Solar Thermal Collector

In this research paper, an attempt has been made to come across the effect of distance between double glazing on the efficiency of a solar thermal collector. Experiments were carried out on an active solar energy demonstration system (ET 200). Commercial glass pane of 3 mm thick having the same dimensions as that of the apparatus was placed above the collector at a distance of 2 cm, 4 cm and 6 cm. Tests were done with and without the added glass. Experiments were performed for double glazing with two positions of the light meter. In one position, it was placed in the middle of the collector surface. While, in the other, the light meter was placed in the middle of the added glass. To study the effect of double glazing on the performance of the solar collector ET200, the correct position of the light meter was to place it exactly in the middle of the additional pane under the lamp. Double glazing doesn’t enhance the performance of the solar collector because of the high resistance of the system glass air glass. The efficiency of double glazing solar collector decreases with increasing the distance separating the two glasses.

Fabrication and Characterization of Nano-Structured ZnS:Cu LED

A wide range of Light Emitting Diodes (LEDs) applications, from general lighting to transmission sources of the Visual Light Communication (VLC) system, makes the LEDs very important to be developed. This research focuses on comparing LED performance due to the variation in surface size and shape of the LED. The research method is carried out with a simulation and an experimental approach. Before the experiment, the LED was simulated with nanopattern variations to determine the best fabrication parameter. The simulation method is carried out using Ansys Lumerical FDTD 2021. The experiment method used to fabricate nanopatterns on the surface of a semiconductor LED layer uses the nanoimprint lithography method. Stamps for nanoimprint lithography are made using Polydimethylsiloxane (PDMS), and the nanopattern sources are obtained from DVD and Blu-ray grating patterns. The characterization of nanoscale patterns was carried out using a Scanning Electron Microscope (SEM). The light emission intensity is measured using a lux meter at a series of emission angles. The results obtained from this research are that the smaller the width and the periodicity of the grating nanopattern, the light produced will be distributed at a wider angle, but the light intensity will decrease; conversely, for a planar surface without a grating nanopattern, level of focus and intensity of light will be higher. In addition, the thicker the ZnS:Cu layer, the better the intensity of the light produced.

Audit Energi Untuk Pencapaian Penghematan Penggunaan Energi Pada Bangunan Gedung Perkantoran

In line with the concept of environmentally friendly national development, every commercial and industrial activity must be committed to preserving the environment. This is in accordance with Law no. Regulation Number 32 of 2009 concerning Environmental Protection and Management. Referring to Law No.30 of 2007 concerning Energy, which was then followed up with Government Regulation No.33 of 2023 concerning Energy conservation which requires energy users above TOE to carry out Energy conservation by conducting periodic Energy Audits of Lighting Systems and Air Conditioning Systems . This research conducted an audit of lighting and air conditioning systems by collecting data on lighting intensity, temperature and humidity in each room in the office from 08.00 – 17.00 using a lux meter measuring instrument, then the results were analyzed by referring to the Indonesian National Standards (SNI) regarding lighting and Minister of Energy and Mineral Resources Regulation No. 13 of 2012 concerning Saving on Electricity Use. The use of electrical energy in the office work environment is still not optimal and even though the density value is satisfactory, the lighting level in the office still has rooms that do not meet SNI standards. Apart from that, the use of electrical energy for the air conditioning system is also considered insufficient so several recommendations need to be made

Performance Test of Polycrystalline 200 Wp Capacity Solar Panels in Laikang Village

This research is a pre-experimental design (non-design) study which aims to determine how much electricity generation performance of Solar Cell technology is under static load. The independent variable in this study is the intensity of sunlight at the installation location of the Solar Cell technology, while the dependent variable in this study is the performance of the Solar Cell technology, namely voltage (V), current (I), resistance (Ohm) and power. This research uses Solar Cell technology power generation. This research was conducted in Padang Savana, Laikang Village, Mangarabombang District, Takalar Regency, South Sulawesi. The research data were obtained by measuring the input and output of the 200 WP solar cell hybrid technology to determine power and efficiency. To determine the performance of Solar Cell technology against solar radiation, it can be determined by measuring using a lux meter, Avometer, Watt Meter, Tang Ampere. The data analysis technique is descriptive analysis. Based on the results of data analysis, a minimum output power of 12.68 W is obtained with a minimum solar cell efficiency of 4.65% and a maximum output power of 194.2 W with an efficiency of 12.22%. This can be interpreted that the power generation performance of Solar Cell and Wind Turbine technology at static loads is not in accordance with the stated specifications.

Laser Phase Rangefinders: Ways to Improve Accuracy

Scientific and technological progress in the field of geodetic and industrial measurements in terms of the use of laser rangefinders operating in ranges up to 5000 meters has led to a reduction in the error of such measuring instruments over the past ten years by two or more times. Such rapid development of high-precision rangefinder technologies has led to a significant revision of the requirements for their metrological support, as well as to the need to develop a new generation of length standards, the stock of metrological accuracy of which would provide an assessment of the metrological characteristics of all types of existing and promising length measuring instruments with a laser rangefinder. To solve this problem, the Institute’s staff conducted research within the framework of a number of thematic research and development works in terms of developing the appearance of a new generation of length standards operating in the range up to 5000 meters in an open atmosphere. Within the framework of this article, one of the developed models of a high-precision complex of measuring instruments for length and coordinate increments is considered, which is a serial high-precision laser phase light meter, modified by the institute’s staff in terms of the system for receiving and processing measuring signals. At the same time, in order to increase the accuracy of length measurements using the developed range finder layout, it is proposed to investigate ways to reduce the errors of the model components of the boundaries of its error. To ensure the smallest error in determining the hardware correction of the rangefinder layout, it is proposed to use funds from the state primary special standard of the unit of length. As promising ways to reduce the error in determining the phase difference of signals, it is proposed to use digital recording and signal processing devices that implement a method for calculating the phase difference of signals by mathematically processing the recorded data using a specially developed computational algorithm based on Fourier analysis. For the most accurate determination of the values of the pulse repetition frequency of signals and the values of the speed of light on the measured track, it is proposed to improve the means of determining these indicators. The use of the proposed methods to improve the accuracy of measuring the length of laser phase rangefinders allows you to provide the necessary margin of metrological accuracy.

Using a Mobile Phone as a Measurement Tool for Illuminance in Physics Education

Most primary school students in the Czech Republic have a mobile phone. A mobile phone can measure many physical quantities once the appropriate application has been installed. The terms “Light Meter” or “Lux Meter” are names for applications that measure the physical quantity illuminance. At the time of writing, there are more than 50 such applications available on Google Play. These applications utilise data from the ambient light sensor. The study describes the measurement of illuminance using laboratory equipment and mobile phones with installed applications and further explores the reliability of data collected by mobile phones. A comparison was made between data from applications that were in the default settings and calibrated. The values of different applications installed on the same mobile phone were compared, as well as values of the same application installed on different mobile phones. Values were compared at different distances from the light source and at the same distance, but with varying angles. The reaction time for a mobile phone application to detect changes in illumination was measured. Sensitivity to infrared and ultraviolet radiation was also investigated. Seven general conclusions were drawn from all measurements regarding the use of a mobile phone as a luxmeter instead of professional laboratory equipment, provided that the recommendations are followed.

PENILAIAN FAKTOR CAHAYA SIANG DI BILIK KULIAH POLITEKNIK KUCHING SARAWAK

The simplest form of description for the distribution, penetration and intensity of daylight is called the Daylight Factor (DF) which results from natural light (sunlight), the DF value is written as a percentage. This value is the ratio of the internal brightness at a point in a room to the natural external brightness on a horizontal surface. As a guide, the brightness inside the building and the associated distribution can be classified according to the natural daylight factor. The necessary natural daylight factors are lighting, glare and thermal comfort. Aspects of classroom lighting and decoration that can promote discomfort and affect task performance due to glare, and flicker (illumination waves above 100 Hz) that cannot be seen from fluorescent lighting. The focus of the study is to measure the level of natural daylight in the classroom. The main purpose of the study was due to students' complaints about the glare and discomfort of the lecture room. The equipment used is lux meter, anemometer and measuring meter. The results of the study show that the lecture room has a level of illumination that meets the standards, glare that cannot be seen and is acceptable for thermal comfort. The sky condition during the study was 100% cloudy with cloud cover. The average illuminance in the lecture room is 276.5lux in a cloudy sky situation (standard 5000-20000 lux) and the daylight factor (DF) of the day is 1.2 in the range of 1.00 to 3.5. The conclusion for this study shows that the daylight factor from natural light in the lecture room at the academic building of Politeknik Kuching Sarawak achieves acceptable standards for lighting, glare and thermal comfort, referring to the MS1525 and CIBSE A standards.

PENILAIAN JEJAK KARBON DAN KESELESAAN TERMAL DI BENGKEL WELDING DAN KONKRIT

Abstract: Global warming is the phenomenon of global temperature increase from year to year due to the greenhouse effect. Currently, carbon dioxide concentrations are estimated to be most dominant in the atmosphere. Therefore, this carbon footprint study will be conducted in the institutional area to determine the actual amount of CO2 present in Politeknik Kuching Sarawak institution. Research on ways to reduce carbon dioxide emissions will also be conducted indirectly. The objective of the study was to analyze carbon dioxide footprints in skill institutions that emit large amounts of gas emissions. Adaptive thermal comfort model is methods can be identified from previous readings to record or analyze data by using Air Quality Detector, Lux Meter and Anemometer. While to refer and compare the data obtained, we refer to the existing standards that are ASHRAE 55 standards and CIBSE Guide A. The result found is carbon footprint in concrete and welding laboratory in Politeknik Kuching Sarawak institution is still in the safe range but measures or proposals to reduce carbon emissions need to be initiated to maintain safety in terms of ventilation and environment in the institution.

Walking After Dark: A Sidewalk Illumination Case Study in Cedar City, UT

Sidewalks are an important part of public space, but they are becoming increasingly dangerous, especially at night. Therefore, it is important that sidewalks are adequately illuminated to meet the safety, comfort, and accessibility needs (i.e., provide high levels of pedestrian reassurance) to sidewalk users. The objective of this case study was to quantitatively measure and subsequently explore the spatial and statistical distributions of light intensities along the sidewalks that surround Southern Utah University in Cedar City, Utah. A secondary objective was to develop a set of “adequate lighting” guidelines (i.e., 5 to 10 lux) to help identify areas that could benefit from sidewalks lighting enhancements. A digital light meter was used to measure horizontal light intensity, in lux, at a systematic sample of 208 points along the sidewalks within the study area. Geographic coordinates were also collected for each sample observation to enable mapping and spatial analysis of the light intensity data. Results indicate 61% of the observations have lux values equal to zero (complete darkness), 13.4% met or exceeded the minimum guidelines, while 4.3% fell within the “adequate lighting” guidelines adopted by this case study. These results suggest that sidewalks are too dark in too many places to provide reassurance to sidewalk users in the study area. The mapping and spatial analysis results from this case study also provide information to support targeted visibility enhancements of sidewalks within the study area. KEY WORDS: Lighting; Optimum Illuminance; Luminometer; Sidewalks; Pedestrians; Safety; Security; Reassurance

Evaluation of luminance levels. digital tool or traditional device? case study: Alameda Park in Saltillo, Mexico

Assessing luminance levels in outdoor public spaces is relevant for the lighting design of architectural and urban environments. This article compares a digital tool and a traditional device for measuring luminance levels in outdoor settings, aiming to explore the pros and cons of each method and offer guidance to public space designers. The study involves a literature review of luminance measurement techniques and a comparative analysis of the results obtained using Fusion Optix software and a lux meter. Both methods exhibit benefits and drawbacks, with the choice of method hinging on the specific context and evaluation objectives. Generally, digital tools provide a more efficient and precise measurement of luminance levels, while traditional devices contribute to a broader understanding of the lighting environment. It is recommended that a combination of digital tools and traditional devices be employed in luminance assessments to achieve the most accurate and comprehensive results.

Clove (Syzygium aromaticum) Drying Using Hybrid Rack-Type Drying House

The objective of this research is to analyze the drying time of cloves using a hybrid rack-type drying house. The study was conducted for 60 days in Harapan Jaya Village, Wayratai Subdistrict, Pesawaran Regency, Lampung. The tools used include a rack-type drying house, Lux meter UT383, digital scale, grain moisture meter AR991, analog thermometer, hygrometer, and a gas stove. The tested material in this research was fresh cloves, amounting to 12.5 kg. The experimental method with two different treatments was employed in this study. Firstly, testing without additional energy was divided into drying using a drying house (using natural energy or sunlight) and sun drying without a drying house. Secondly, testing with additional energy included drying using a drying house with additional energy from sunlight and gas-fired heaters. Based on the research results, it can be concluded that the time required to dry 22.5 kg of cloves to a moisture content of 12.5% is as follows (1) drying with a drying house using solar energy takes 180 hours (8 days), (2) drying with a hybrid drying house using solar energy and gas takes 132 hours (6 days), (3) sun drying using traditional methods (without a drying house) takes 162 hours (7 days). The hybrid drying house is suitable for the drying process in high-altitude areas or during cloudy or rainy weather, as it can continuously carry out the drying process, whether there is sunlight or not. Keywords: Cloves, Drying, Drying Time, Hybrid, Post-Harvest.

TINJAUAN TATA KELOLA RUANG FILLING BERDASARKAN ILMU ERGONOMI DI PUSKESMAS WANAREJA 1

The lighting for the medical record room at the Wanareja Health Center 1 was uneven throughout the room and the area of ​​the storage room did not meet the standards. This type of research is descriptive qualitative. The object used is the medical record room. The research instruments were room thermometer, meter and lux meter. How to collect data by observation and interviews. For data analysis using descriptive analysis. The results of the study showed that the lighting in the medical record document storage room at the Wanareja Health Center 1 ranged from 137-140 lux but was not evenly distributed throughout the room while the patient registration room ranged from 101-103 lux, the temperature of the medical record room was 23.1oC, the humidity in the medical record room that is 51% so that includes humidity, storage space area of ​​4 m² x 2.5 m² x 3 m². This affects the productivity and performance of the officers themselves. Based on the research results, the proposed solutions and suggestions are expected to improve the lighting of the medical record room and increase the area of ​​the room to make it easier for officers to retrieve or return medical record files so that they comply with established standards and it is advisable to provide lighting, temperature and humidity measuring devices.
 
 Keywords: Ergonomics Aspect, Layout, Medical Record Storage.

Accupational Cleanliness Health and Safety Management System In Light Rail Transit at South Sumatera

Theoretical Framework: Occupational Accidents and diseases are among the highest cases in the world today. Occupational health and safety is a human right, therefore the importance of a culture of occupational health and safety in every industry and office. The cases that often occur in light rail transit are noise, lighting, temperature, humidity, and cleanliness. The latest finding is that there has never been an audit of the Light Rail Transit Occupational Cleanliness Health and Safety Management System. Purpose: The aim of this research is to find out which criteria CA2, CA3 and CA4 are most dominant in noise, lighting, temperature, humidity and cleanliness. Method: The method used in this study was a field survey for taking noise samples using the SM-20-A sound level meter, for lighting samples using a Lux light meter LM-120, for temperature and humidity sampling using a Thermo Hygrometer HTC-2. On environmental cleanliness using a questionnaire on South Sumatra LRT employees. After taking the sample, the researchers conducted an analysis using the univariate method of each independent and dependent variable, which was carried out at 13 South Sumatra LRT stations. Result an Conclusion: The LRT passes through every bend with a noise level of up to 100 dB (˃85 dB). It does not comply with NIOSH standards at every bend. The lighting test results for the South Sumatra LRT were not complied with at the LRT Depot in the employee's office, with a measuring result of 88,4 lux. Tests on the room temperature at the South Sumatra LRT station revealed that it was pretty high and did not adhere to the work space's maximum temperature standards. Only the CA4 location, out of all the measurement points, met the required temperature of 25 °C. Every station also performed measurements of the air humidity. Each measurement site satisfies the air humidity standard of 70%. The hygiene inspection majority had fulfilled the Standard Operating Procedure (SOP) for cleanliness based on Cleanliness, Health, Safety, and Environment Sustainability (CHSE). The conclusion is that CA2 is the most dominant case with the highest level in each criterion, especially in the case of noise.

Crown Density Relationship to Microclimate and Comfort Index in Telaga Sari City Forest, Balikpapan, East Kalimantan, Indonesia

The development of urban areas that are increasingly developing causes the area of green open space to decrease, and urban buildings that are increasingly denser result in an increase in local temperatures in the city. The presence of vegetation will provide cooler air. Furthermore, the urban microclimate is an interesting thing to correlate with the presence of vegetation somewhere. The Telaga Sari City Forest is one of Balikpapan’s green open space places. This research analyz the relationship between crown density microclimate and comfort index. The method for the percentage of crown density used Habitapp App. To measure the microclimate used Thermohygrometer, and Lux Meter. From the research results, it is known that, at the Telaga Sari City Forest there is a strong relationship between crown density and microclimate, namely light intensity, temperature, humidity, and the comfort index/THI, successively the multiple R values of 0.87, 0.83, 0.78 and 0.81. The linear equations namely y = -23.677x + 1986, y = -0.0317x + 31.096, y = 0.119x + 65.891 and y = -0.0232x + 29.007. In order to create a favorable microclimate in the city and provide green open space, it required to plant trees with high canopy density values.