Re: [ST] Blue headlights

[Blake Sobiloff <sobiloff@xxxxxxxxxxxxxx>]

Lex Offer wrote:

 > So the blue
 >  headlight bulbs might be an attempt to add a bit of UV radiation
 > to the headlight beam to improve visibility.

No, blue headlight bulbs are purely for style. They merely attempt to 
imitate the expensive HID lighting systems.

 > So some UVA driving lights could help you see
 > roadsigns, road markers and people a bit sooner than with low beams
 >  alone.

True, and a very interesting development, but the UVA bulbs are entirely 
different from regular visible-light bulbs. Personally, I wonder about 
the long term effects of getting blasted with UVA light while driving, 
but I guess that's why Philips (and others) are still doing studies and 
haven't released the bulbs for sale yet.

 > As for my conclusion as to why vision plus lamps aren't
 > offered over here in the US is that US regulations state that head
 > lamps must be at least 55W and the vision plus are 35W,

Hmm. They're available in H4 form, which is a 60W/55W format, so I don't 
think that's the issue. In fact, Daniel Stern (Stern Lighting, 
<http://lighting.mbz.org/>) says he'll be getting them here in the US in 
a couple of months. My guess is that it's primarily a 
marketing/verification of DOT compliance issue.

- -- 
Blake Sobiloff <sobiloff@xxxxxxxxxxxxxx>
Burlingame, CA, USA


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