The optical system of the luminaire is the soul of the […]
The optical system of the luminaire is the soul of the luminaire. The purpose is to design a luminaire optical system that meets the specific lighting requirements according to the characteristics of the selected light source. Generally, the optical system of a conventional light source luminaire consists of a light source, a lamp holder, a reflector, and a transmissive cover. Since some LED units have a luminosity characteristic of 2π luminescence, the luminosity system of the luminaire is quite different from the conventional illuminant lamp. The specific performance characteristics are as follows:
(1) LED luminaire optical system generally consists of LED chip and lens composed of LED unit or LED unit array. The array is sometimes arranged on a flat aluminum substrate, or on a protruding or concave shaped substrate. The luminaire is used or not. Use a translucent cover. The luminaire manufacturer can combine multiple LED units or dozens of LED units on the substrate according to lighting requirements. Attention should be paid to control the consistency of the color of the LED unit after the combination, and the color space uniformity of the LED luminaire should be evaluated.
(2) Since the photoelectric characteristics of the LED are very sensitive to the change of the PN junction temperature; the encapsulating resin will rapidly deteriorate under high temperature and strong light irradiation; the long-term optical radiation will gradually reduce the photoconversion rate of the phosphor and lead to the color seat. The target offset. When evaluating the life of an LED lamp, the lumen maintenance rate of the LED lamp is usually evaluated under the condition of limiting the color shift.