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From: richard@gryphon.COM (Richard Sexton)
Newsgroups: rec.autos.tech,sci.electronics
Subject: Car headlights
Keywords: question
Message-ID: <23418@gryphon.COM>
Date: 14 Dec 89 23:04:47 GMT
Organization: Trailing Edge Technology, Redondo Beach, Ca.
Lines: 10

After spending the last month researching various lighting
systems for my fishtanks, I have to ask:

Whay are car headlights still crude tungstan filament (appx. 20
lumens per watt) whenthey could be metal halide (> 100 lumens
per watt)?

Certainly the power to tunt is more or less ``free'', but
could not a lot more light be shed on the road from a good
set of metal halide headlamps ?