The advent of LED luminaires has changed the entire lighting market, replacing the original halogen and fluorescent tubes (CFLs) on buildings and streets. Engineers often compare LED lamps from different manufacturers and choose the best style. But how do you ensure that engineers choose the most suitable fixture?
LED Test Manual Guide
The Lighting Engineering Association (IES) is a non-profit organization that publishes publications as a reference for lighting applications and science. It is also a partner sponsor of ASHRAE/IES Standard 90.1 and Standard 189. The association publishes a number of documents related to lighting and energy.
IES has a number of LED-related manuals that help engineers clearly identify the authenticity of LED fixtures. One of the manuals is LED LUMENS-79-08 Electrical and Photometric, which sets a standard procedure for testing LED products . The manual details methods for testing lumens, luminous power, illumination intensity (candle), illumination directionality, color temperature, and color rendering index (but only for LED fixtures, not including LED chips , packages, and modules.)
The LM-79-08 manual specifies the environment and variable parameters (such as ambient temperature) during the test, as well as the relevant test data of each LED lighting product, such as the test mechanism, date of inspection, and lighting performance data after inspection. It is not always possible to retain a statement of uncertainty.
The illumination power is calculated in units of lumens per watt (the amount of light produced). In the past few years, LED power has continued to increase, from 50 lumens per watt to 130 lumens today. Usually cool white LEDs are more efficient than warm white LEDs. In contrast, traditional luminaires have lower power. The white light bulb produces 15 lumens per watt, the CFL produces 60 lumens per watt, the fluorescent tube produces 100 lumens per watt, and the high-end metal halide lamp produces 100 lumens per watt.
LED power has increased in recent years, and it is estimated that LED lamps producing 100 lumens per watt will be popular everywhere soon. Researchers in the lab have now succeeded in producing LED bulbs that produce more than 200 lumens per watt. LEDinside pointed out that compared with the recent US manufacturer Cree, it has announced 170 tons of commercial LED bulb prototype products per watt, and is negotiating with the industry about the actual production time and quantity.
Life cycle
LED lamps have a long life. Like other bulbs, LED bulbs will gradually reduce the amount of light output over time. But unlike other bulbs, LED bulbs will gradually darken rather than burn out directly, unlike other bulbs that suddenly break down directly. Inappropriate temperature, power, and moisture are the main causes of LED damage and a factor in determining LED life.
IES has another manual guide for LED light sources and modules - LUMENS-80-08 Measuring Lumen Maintenance of LED Light Sources, to develop a program for detecting the life of LEDs (and when the illuminance becomes darker).
The lifetime of an LED is determined by the number of hours that the number of power drops to a certain threshold, which is also known as lumen maintenance.
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