Nowadays, 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 the damaged light source and the control device of the lamp designed for 10 years of life. The life of traditional light source luminaires is not evaluated. The life of an LED luminaire is related to the life of the LED itself, the LED driver and the environment in which the luminaire is supplied to the LED, and many other forms of LED lamps. Except for the LED with a standard lamp head, other LED lamps are not interchangeable. The life of different LED luminaires can only be determined by the relevant life evaluation. When evaluating the life of an LED luminaire, 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 utilized by the luminaire are different from those of conventional luminaires. Traditional lighting fixtures are evaluated with luminaire efficiency, while LED luminaires are evaluated for efficacy.
At present, LED lamps and traditional light source lamps have many different places in terms of performance, evaluation and design.
In the performance evaluation of LED lamps
a) Color space uniformity evaluation to evaluate the difference in viewing angle color of the presence of LED luminaires.
The characteristics of a single illuminant of a conventional light source are different. The LED lamp used in the LED luminaire is composed of a plurality of illuminants and emits light. There is a color difference between the illuminants in the LED luminaire, and the color space uniformity evaluation is needed to evaluate the color of the LED illuminator. Spatial distribution.
b) Unlike traditional illumination sources, photometric testing can be performed separately. Relative method can be used for photometric measurement. LED light source is extremely sensitive to temperature. It is not suitable to separate the LED light source from the lamp. Separate measurement should be used for photometric measurement. The photometric test was performed as a whole.
In the design of LED lamps
LED luminaires are clearly distinguished from traditional light source luminaires in terms of optical system design, electrical accessories, heat dissipation measures, and structural design.
a) Optical system
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 translucent cover. Since some LED units have a photometric characteristic of 2π luminescence, the luminosity system of the luminaire is quite different from the conventional illuminating lamp. The specific performance characteristics are as follows:
(1) LED lamp optical system consists of
an LED chip and a lens unit or an LED unit composed of LED arrays, arrays sometimes arranged on a flat
aluminum plate may also be formed on a substrate or a concave protrusion, luminaires, or 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.
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