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What is an achievable realistic lumen per watt that can be achieved in a consumer LED fitting.
LOSSES IN EFFICACY WILL BE CAUSED BY THREE FACTORS:
- Losses due to a higher operating temperature of the LED vs the stated Tj of 25°C
- Electrical Losses from the LED Driver
- Optical losses caused by reflectance, optical lenses and clear or diffused covers
At a junction temperature of 85°C this goes down to 169 lm/W
With power supply efficiency of 90% this comes down to 152 lm/W
With optical losses (normal efficiency ranges from 80 - 90%) this further comes down to about 130 lm/W
Remember this is using the best leds on the market that come at a premium.
This bears out when looking a credible manufacturers of luminaires. see www.cree.com
Their lumanairs generally range from 110lm/w to 130lm/w
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| Asked: 10/4/18, 5:29 AM |
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| Last updated: 10/4/18, 5:33 AM |