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To: rudedog who wrote (100676)	3/11/2000 1:26:00 AM
From: ptanner	Read Replies (1) \| Respond to of 186894

rudedog - OT <The majority of the power a lightbulb uses goes out as light, not heat - after all, that's the point of the thing... I think the heat output of a 60W incandescent bulb is about 20W (a little higher for a long-life bulb).> Nope. Number I recall from school is that for incandescents about 90% of the energy goes for heat not light. Fluorescent bulbs have much better efficiency and LEDs (they just figured out how to make white ones) have very high efficiency. And if the light bulb is in an enclosed space then all the light ultimately converts to heat. PT

To: rudedog who wrote (100676)	3/11/2000 11:52:00 AM
From: nihil	Read Replies (2) \| Respond to of 186894

Incandescent bulbs produce about 7 to 22 lumens per watt, compared to 60 to 140 lpw for high pressure sodium bulbs. Most of the energy converted by incandescent bulbs dissipates as heat (infrared radiation) rather than as visible light. If one fingers a bulb most of the visible light will be converted into heat in the fingers unless it is reflected off the skin (less than 10 per cent usually) so you may notice that you can burn your skin painfully on a very bright sodium bulb (such as a projector bulb). You may also blow out the bulb because the ordinary oil on the skin instantaneously overheats.