At present, there are many differences between led light and traditional lamps in terms of performance, evaluation and design.
a)Color space uniformity to evaluate the existence of LED light different observation Angle color differences.
The characteristics of a single illuminant of traditional light source are different. LED light are composed of multiple illuminators and emit light. There are color differences among the illuminators in LED light, so it is necessary to evaluate the spatial distribution of color of LED lamps by evaluating the uniformity of color space
b)Use life to evaluate the durability of LED light.
The measurement and evaluation of the life performance of traditional light source have been standardized, and have the interchangeability, so the life of traditional light source and lanterns can be replaced by the damaged light source, and the lamp control device designed according to 10 years of life to meet the requirements, so generally do not evaluate the life of traditional light source and lanterns. The life of LED light is related to many factors, such as the life of LED itself, LED driver and the environment provided to LED by the lamps. At present, there are many forms of LED lamps. Except for the LED with standard headlights, other LED light are not interchangeable. When evaluating the service life of LED light, not only the maintenance life (LX) of light pass should be claimed, but also the failure efficiency (FX) should be claimed.
c）The evaluation parameters of the proportion of luminous flux that can be utilized by lamps are different from those of traditional lamps. Traditional lighting lamps are evaluated by their luminaire efficiency, while LED lamps are evaluated by their luminous efficiency
LED lamps are significantly different from traditional light source lamps in terms of optical system design, electrical accessories, heat dissipation measures and structure design.
a）The optical system
The optical system in lamps and lanterns is the soul of lamps and lanterns. According to the characteristics of selected light source, the optical system of lamps and lanterns is designed to meet the specific lighting requirements. The optical system of traditional light source lamps and lanterns usually consists of light source, lamp holder, reflector and light transmittance hood. Luminosity systems differ greatly from traditional light sources due to the luminosity properties of some LED units that are 2 PI. The specific performance characteristics are as follows:
(1)LED lighting optical system is generally composed of LED chip and lens LED array or LED module, the array is sometimes arranged on the flat aluminum substrate, may also be on the raised or concave forming substrate, the lamps use, or do not use light mask. Lighting manufacturers can combine multiple LED units or dozens of LED units on the substrate according to lighting requirements. They should pay attention to the consistency of light color of LED units after combination and check the uniformity of color space of LED light.
(2)Because the photoelectric characteristic of LED is very sensitive to the change of PN junction temperature; Packaging resin will rapidly deteriorate under high temperature and strong light irradiation; Long-term light radiation will gradually reduce the photoinduced conversion rate of phosphors and cause the color coordinates to shift.
b） Heat dissipation
Like traditional light source , LED light also generate heat. The heat of LED light comes from losses in LED photoelectric conversion and LED driving power supply.Different from the principle of traditional electric light source luminescence (thermal radiation of incandescent lamps and gas discharge of fluorescent lamps, etc.), LED luminescence is electroluminescence. Due to the problem of conversion efficiency, most of the energy output is mainly converted into heat energy in the form of non-radiation composite lattice vibration.But the heat transfer way in the LED is not radiation but conduction.In the heat dissipation design of LED lamps, the main objective is to effectively conduct the heat of LED chip out and effectively control the temperature of LED junction in LED light.
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