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by abduhl
4586 days ago
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The question is a matter of power then. A 100W bulb at 5% light is 5W of light (assuming power vs energy can be compared this way... I don't do electrical engineering) which would correspond to a 35W LED producing less than one half of the heat when you consider that snow piling up in front of a light and the light enclosure will convert the IR to heat. |
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Light measurement depends on the "use case":
Needed energy/power vs. How much "light" can be used by the human eye. Or, how good is the light suited for selecting pairs of (black?) socks: http://en.wikipedia.org/wiki/Color_rendering_index
That's why there are so many ways of measuring light: http://en.wikipedia.org/wiki/Light#Units_and_measures