Abstract
The aim of this paper is to study the reproducibility of measurements in LED lamps. For research purposes as well as for standardized tests, there is a need for measurements to be reproducible so that results can be accurately compared. The knowledge regarding which parameters and test conditions will influence the results is therefore crucial. This paper aims at identifying how changes in supply voltage and ambient conditions impact the results and defining a methodology to determine when an LED lamp is considered stable. The paper describes the differences in illuminance and active power under different ambient conditions and supply voltages for several LED lamps for indoor use. Variations in illuminance and active power are also studied within the stabilisation time. A consistent methodology for temperature measurement is explained and used in this paper.
Highlights
Due to their low consumption, good efficiency and high durability, LED lamps are currently used for many applications in domestic use as well as in street lighting
4.1 Stabilisation time The evolution of temperature, active power and illuminance over time is considered with the aim of studying the stabilisation of LED lamps
This paper investigates the impact of supply voltage variations and ambient conditions changes on LED lamps
Summary
Due to their low consumption, good efficiency and high durability, LED lamps are currently used for many applications in domestic use as well as in street lighting. Regardless of the aim being time of failure, light output quality or some power quality index, it is important to eliminate uncertainties affecting the reproducibility of the aforementioned tests. These uncertainties can be e.g. variations in the voltage feeding the lamp or variations in the ambient temperature during the measurement. To achieve better reproducibility when measuring LED lamps, it is recommended to allow the lamp burning for a certain amount of time, i.e. enough time to reach a stable operating temperature. It states that some types of lamps require more time and that the corresponding standard should be applied, EN 62612:20139 for LED lamps. EN 62612:20139 defines the stabilisation time as the time needed to reach ß The Chartered Institution of Building Services Engineers 2020
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
