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From: geopi@cbnewsh.ATT.COM (george.p.cotsonas)
Newsgroups: rec.autos.tech,sci.electronics
Subject: Re: Car headlights
Summary: new lamps coming
Keywords: question
Message-ID: <6849@cbnewsh.ATT.COM>
Date: 21 Dec 89 21:54:18 GMT
References: <23418@gryphon.COM>
Organization: AT&T Bell Laboratories
Lines: 19

In article <23418@gryphon.COM>, richard@gryphon.COM (Richard Sexton) writes:
> 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)?

I read an article recently about a HID (high intensity discharge)
lamp coming out of (I think) GE, which should become available in
some cars in the early 90s, and more generally available in the
late 90s with complete headlamp assemblies slimming down
to a mere 1" diameter.

The active part is only about 5/16" wide and an inch or two long.

So, those crude tungsten filaments may well become a thing of the past...
-- 
George P. Cotsonas                George.P.Cotsonas@att.ATT.COM
AT&T Bell Laboratories            or        geopi@hocpa.att.com
Holmdel, New Joisey               or            att!hocpa!geopi