Performance evaluation of LED lamps
a) Evaluation of color space uniformity to evaluate the color difference at different viewing angles for the existence of LED lamps.
The characteristics of a single illuminant of traditional light sources are different. LED lamps used in LED lamps are composed of multiple illuminants and emit light. There are color differences between illuminants in LED lamps. It is necessary to use color space uniformity evaluation to evaluate the color of LED lamps. the spatial distribution of .
b) Use life to evaluate the durability of LED lamps.
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The measurement and evaluation of the life performance of traditional light sources have been standardized and interchangeable, so the life of traditional light source lamps can be met by replacing damaged light sources and the control device of lamps designed for a 10-year life, so it is generally not evaluated. The life of traditional light source lamps. The life of LED lamps is related to many factors such as the life of the LED itself, the LED driver and the environment provided by the lamps to the LED, and there are many forms of LED lamps at present. Except for LEDs with standard lamp caps, other LED lamps are not interchangeable. The life of different LED lamps can only be determined through relevant life evaluation. When evaluating the life of LED lamps, it is necessary to claim not only the lumen maintenance life (LX), but also the failure rate (FX).
c) The evaluation parameters of the luminous flux ratio that can be used by lamps are different from those of traditional lamps. Traditional lighting fixtures are evaluated with luminaire efficiency, while LED fixtures are evaluated with luminous efficacy.
d) Unlike traditional lighting sources, which can be independently tested for photometry, the relative method can be used in photometric measurement. LED light sources are extremely sensitive to temperature, and it is not suitable to separate LED light sources from lamps for separate measurement. The absolute method should be used for photometric measurement. The overall photometric test is carried out.
