Led Energy
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Are candles more energy efficient than LED bulbs of the same luminosity?
How many watts/lumen are used by each to produce the same luminosity.
Depends how you define efficiency and where you make the cut. A small candle ('Teelicht' in German, the kind you put under a pot of tea to keep it warm) provides around 35W of heat. Assuming (!) that this is comparable to the light output of roughly a 0.1 W LED, the candle would use 350 times more energy than the LED.
The problem is: how much energy was used to make the candle, and how much energy was used to create the electricity that powers your LED?
Let's spin this: assume that the production of the candle didn't use any energy (worst case for the assumption that the LED is better than the candle). Further assume that the thermal efficiency of the power station is 30% (might be better, might be worse), the efficiency of electricity transport to your house is at 90% and the efficiency of the LED power supply is at 70%. Then you'll get 0.3 x 0.9 x 0.7 = 0.189 or just short of 19% efficiency from the burning of gas/coal at the power station to the input of the LED. In turn, that means that in order to power the LED with 0.1 W, you'll have to burn a bit over 0.5 W worth of coal/gas at the power station - still much less than the 35 W from the candle.
You may notice that I didn't put in the efficiency of the LED. As long as we say that a LED that is powered with 0.1 W is as bright as the candle, that value is irrelevant. However, you might find that different LEDs at 0.1 W shine with a different brightness. But even if you use a 1 W or 2 W LED (and a current 2 W LED is _very_ bright compared to a candle), that still would see the LED better off.
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Rank 1 - LED There Be Light (Trance Energy 2009 theme song) (Official Video)
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