The life of LED lamps and LED life, LED driver and lighting provided to the LED environment and other factors related to, but more the form of flexible L.E.D strip lights, in addition to with a standard lamp LED other LED lights do not interchangeable, so that LED lamps, the life can be determined only through the life evaluation. In the evaluation of the LED lamp life, not only claimed the life lumen maintenance (LX), but also claimed that the failure rate (FX).
c) the proportion of luminous flux of lamps can take advantage of the evaluation parameters and the traditional lighting. Traditional lighting luminaire efficiency to evaluate LED lamps use light efficiency evaluation.
LED lamps and traditional light fixtures on the performance evaluation and design, there are many different places.
LED lighting performance evaluation
a) color space uniformity of evaluation to evaluate LED lamps of different color difference of the observation angle.
Traditional light a single light-emitting characteristics of the LED lamp LED lamps use of multiple light and luminous flexible L.E.D strip lights between the color differences, need to use the uniform color space evaluation to evaluate LED lighting color spatial distribution.
b) Unlike traditional lighting can be used alone for photometric testing, photometric measurements using the relative method, the flexible L.E.D strip lights source is extremely sensitive to temperature, not suitable for the flexible L.E.D strip lights from the fixture, a single measurement, photometric absolute method should be used on the lamp overall photometric test.
LED lighting design
LED lamps compared to the optical system design, electrical parts, cooling measures and structural design with the traditional light source lamps obviously out to do.
a) optical system
The lamp optical system is the soul of the lamp, its purpose is to meet the specific lighting requirements according to the characteristics of the selected light source design a lighting optical system. Usually the traditional light source lamp optical system consists of a light source, lamp holder, reflector, and through the mask. Some LED unit has the characteristics of the 2π glowing luminosity, the photometric system of lamps and traditional light source light is very different. Specific performance characteristics are as follows:
(1) LED lighting optical system is generally by the flexible L.E.D strip lights and the lens of the LED unit or LED unit array, the array is sometimes arranged in a flat aluminum base board, may also be forming on the substrate protruding or sunken, lamps use, or not use through the mask. Lighting manufacturers, lighting needs, multiple LED units or dozens of LED unit combination on a substrate, should pay attention to the control unit LED streetlight color in the combination of consistency, uniformity of the color space of the assessment of LED lamps.
(2) PN junction temperature changes due to optical and electrical properties of the LED is very sensitive; sealing resin rapid deterioration in the heat and glare; long-term optical radiation causes the phosphor, the light-induced conversion rate is gradually reduced, and result in color Block The standard will be offset. LED lighting life evaluation is usually under the conditions that limit the color offset assessment LED lamp lumen maintenance rate.