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What is luminous efficacy?

Published on 2011-05-06 15:43:10 by Admin from: Abrand Technology Co., Ltd

The luminous efficacy is the light output per unit power input. It is measured in lumen per watt (lm/W). Nowadays commercially available LEDs have efficacy of 130 lm/W for cool white and 107 lm/W for warm white light (CREE XLamp MX-6). This is much higher compared to incandescent bulb that produces 15 lm/W and fluorescent lamp with 60-70 lm/W.


However, the efficacy of a single LED should not be mixed with the efficacy of the lamp. Many manufacturers and resellers state the LED Lamp Light Output as sum of the output of the individual LEDs. This is not correct because there are always losses from light trapped inside the lamp. The efficacy of a LED Light Lamp, also called LED Light Engine, can be increased by better design and using high quality materials.
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