Abstract
This paper proposes a control circuit for Light Emitting Diode (LED) luminaire based on the amount of daylight. This system uses both natural daylight and artificial light from a luminaire to reach the desired illuminance on a working plane. The control circuit operates by receiving an illuminance value from a light sensor and comparing it with a set value in the microcontroller before limiting the light intensity of LED by sending a control Pulse Width Modulation (PWM) signal to the LED driver. In the experimental setup, the controller and a physical model of a working space were built in order to field test the LED daylight control circuit. Electrical characteristics such as voltage, current, and power were measured with a power meter. Illumination characteristics in terms of illuminance on a working plane were determined using a lux meter. The results from actual field tests revealed that this LED control circuit was able to reduce the power consumption of the lighting system while keeping the illuminance on the working plane at the standard value. Both simulation results and the actual experiment of the control circuit proved that it could be used to improve the energy efficiency of both newly installed and retrofitted lighting systems.
Highlights
Artificial lighting from luminaire has been an essential part of modern society due to the expansion of urban areas with high-rise building that block the natural lighting, working space that less likely to receive daylight, and night-time activity that required lighting
The result shows that illuminance in the case without daylight control circuit has been steadily luminaire 2 was located at the right-side of experimental setup according to Figure 5a
This paper proposed a daylight control circuit in Light Emitting Diode (LED) luminaire and evaluated its performance
Summary
Artificial lighting from luminaire has been an essential part of modern society due to the expansion of urban areas with high-rise building that block the natural lighting, working space that less likely to receive daylight, and night-time activity that required lighting. Evaluation methodologies and mathematical models have obtained the energy profile and forecast of energy consumption on the lighting system by taken many parameters into consideration for accurate assessment, such as daylight [4], the controller [5], and occupant behavior [6] It shows that the implementation of energy-saving measured in the lighting system has the potential to reduce a considerable amount of energy consumption and improve the overall energy efficiency of a building. The result from the literature review reveals that LED luminaire has a definite advantage over conventional fluorescent luminaires and is suitable to be used in building lighting systems to reduce energy consumption and improve energy efficiency. From the literature review discussed above, it can be seen that daylight control in a lighting system with LED luminaire can further reduce energy consumption and improve energy efficiency to the highest degree.
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