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To: ptanner who wrote (100688)	3/11/2000 4:25:00 AM
From: rudedog	Read Replies (1) \| Respond to of 186894

ptanner - well it's been a long time since I was in engineering school and I think I got it backwards - the number 30% stuck in my mind but now that you mention it, that was probably the light output not the heat output. But the fact that the light eventually gets converted to heat doesn't count here - it doesn't make the bulb hot. For example, your mention of Fluorescent - a 40W Fluorescent has the same light output as a 100W incandescent, which works if 30% of the incandescent input energy is output as light but not if 30% is heat... that would make the Fluorescent 80% efficient. And, of course, they are cool to the touch. But obviously the gas excitation light sources have some different dynamics. A 70 watt sodium bulb has nearly the same light output as a 500 watt halogen bulb.