How to help the buyer choose the most suitable LED lamps?

Cite a simple example, a manufacturer of LED lamps LED special specifications for highway, claiming that the lamp life of up to 100 thousand hours, the color index is 90, power is 100 lumens per watt, and good lighting. A city engineer in the newspaper published the specifications of this lamp, and decided to use the new road lamps. But what do the engineers decided certainly? Any information can ensure the lamp characteristics described are consistent with the fact that the manufacturer? Appeared LED lamps have changed the lighting market, to replace the buildings and streets of the original halogen lamps and fluorescent lamps (CFLs). Engineers often compare different manufacturers of LED lamps, choose the best style. But how to ensure that engineers choose the most suitable lamps?

Caption: high efficiency LED lamps used by Shinkansen vehicles in Japan

LED test manual Lighting Engineering Association (IES) is a non-profit organization, publications as lighting applications and scientific reference. At the same time, ASHRAE/IES Standard 90.1 and Standard is a partner of the sponsor of the organization of. The association publishes a number of documents related to lighting and energy. IES has many LED related manuals, authenticity can help engineers to identify the quality of the LED lamps. One of the manual for LED LUMENS-79-08 and Photometric, set up a set of standard procedures for testing LED products ELectrical. The manual gives a detailed description of the number of lumens tested, the power of light, the intensity of illumination (Zhu Guang), the direction of illumination, color temperature and color rendering index (but not limited to LED lamps, and does not include LED chips, packages and modules). ) LM-79-08 manual set test environment and change parameters (such as temperature), and recording test data related to each of the LED lighting products, such as testing mechanism, testing data and testing date of lighting performance, if not necessarily can retain the uncertainty statement. The calculation unit lighting power is generated by the number of lumens per watt (the light). Over the past few years, LED power has increased, from 50 watts per watt to the current lumen of 130. Usually cold white LED is more efficient than warm white LED. In contrast, the power of traditional lamps is lower. Incandescent bulb produces 15 lumens per watt, CFL produces 60 lumens per watt, fluorescent lamp produces 100 lumens per watt, while the high-end metal halogen lamp produces 100 lumens per watt.

LED power in recent years increasing, the estimated LED lamps can produce 100 lumens per watt shortly after the popularity in the country. Researchers in the lab have now successfully produced more than 200 lumens per watt LED bulbs. LEDinside pointed out that, compared to the recent American manufacturer Cree, has announced 170 LED per watt of commercial prototype products, and the industry is talking about the actual production time and quantity. LED lamp life cycle life is very long. The same as other bulbs, LED bulbs will gradually reduce the amount of light output. But unlike other light bulbs, LED bulbs will gradually darken rather than burn out directly, unlike other bulbs that will suddenly break down. Improper temperature, power and water vapor are the main causes of LED damage and the factors that determine the life of LED. IES has another book devoted to LED light source module and -LUMENS-80-08 Measuring Lumen Maintenance of manual LED Light Sources, to develop a set of testing procedures (LED life and light dark to how the elimination). LED life passes by the power number dropped to a certain threshold when the number of decision, this is also called lumen maintenance. LM-80-08 manual mentioned two different standards adopted by the industry, a prescribed number less than 70% of the original lamp lumens and not suitable for the continued use of another specified number less than the original 50% lumens will no longer use. The first standard (L70) is mainly used in general lighting LED lamps, the second standard (L50) is the use of decorative LED lamps. The two LED life standards are developed by the lighting research center's solid state lighting systems and Technology Alliance Group (ASSIST). For example,, a LED lamp by LM-80-08 detection and claimed by detection of the LED sample using more than 30000 hours after the number of lumens still than the original light output of 70%, which represents 80 through LM but not reach the basic attenuation requirements, even better performance. LEDinside pointed out that the current market LM80 test project costs are very high, about $15 thousand, the reason is to light the thousands of hours to do the test and accurate parameters attenuation data, to spend money to do the manufacturers, are generally medium-sized and large firms. On LED life, LM-80-08 developed a standard test environment and variable parameters. The test report shall cover the important data and the testing process. Typical incandescent lamp life is 1000 hours; CFL is 8000 to 10000 hours; the best fluorescent lamp is up to 30000 hours. The average life expectancy of metal halide lamps is 7500 to 20000 hours (L50), and the average life expectancy of LED bulbs is between 30000 and 50000 hours (L70). LM-80-08 does not provide a method to estimate the life of LED. IES's technical memorandum -TM-21-11Projecting Long Lumen of LED Light Sources data obtained from the LM-80-08 detection process to calculate the maintenance rate of LED light source in. This memo is used to estimate the LED light source maintenance rate and over 6000 hours of life. The IES LUMENS-80 manual provides for three different environmental temperatures. The TM-21 can be estimated based on the results of three kinds of LED light source