Re: LED efficiency
- From: don@xxxxxxxxxxxxxx (Don Klipstein)
- Date: Thu, 21 Jun 2007 22:00:40 +0000 (UTC)
In article <1182449784.388021@athprx04>, Ioannis wrote:
Usually, when we talk about the efficiency of a light source being x
lm/W for example, I understand that every Watt of input power generates
approximately x lumens.
These lumens are of course energy and can be converted back to power, so
the overall efficiency of the light source can be determined as the ratio
(light energy)/(input energy)
The remainder in conventional light sources, is usually wasted as heat.
What is this difference wasted as in LEDs? Is it also heat?
In other words, if I manage to build a 400W LED arrangement with LEDs
which have efficiency 20 lm/W and if I have a 400W metal halide which has
an efficiency of 90 lm/W, which will generate more heat?
Thanks much in advance,
Visible light LEDs tend to convert to non-radiant heat close to 100% of
all energy that does not get converted to visible light.
For same wattage, similar CCT and even same lumens out per watt in, an
LED fixture typically produces more heat than a metal halide fixture does.
Unlike LEDs, HID lamps tend to have a significant part of their losses
being optical band infrared.
An additional challenge for LEDs is that they tend to be less tolerant
of high temperatures than incandescent and HID lamps are.
Heat management gets to be a serious challenge in high power LED
lighting systems.
- Don Klipstein (don@xxxxxxxxx)
.
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- LED efficiency
- From: Ioannis
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