Lights with low heat output
..
Fluorescents get about 100lm/W, the very best white LEDs, run under laboratory
conditions get around 30lm/W, and incandescents get under about 20lm/W.
So, about 50%, 15%, and 10%.
Why do torches and headlamps with LEDs have such an improved battery
life when compared with those with incandescent bulbs? It is
certainly more than the 50% that your figures would suggest.
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