[s-cars] Re: S-CAR-List Digest, Vol 7, Issue 120 Re: 9011 9012 lamps

[Larry C Leung]

> Date: Tue, 25 May 2004 14:02:10 -0600
> From: "Dave Forgie" <forgied at ae.ca>
> Subject: [s-cars] 9011 9012 lamps
> To: <s-car-list at audifans.com>
> Message-ID: <s0b351ff.069 at mail.ae.ca>
> Content-Type: text/plain; charset=US-ASCII
> 
> I've done the 9005 conversion (trim a 65 W 9005 bulb to fit in a 
> 9006 low beam lamp holder) but I would be concerned that the new 
> 9012 lamp with 1875 lumens would be too hot for the DOT plastic 
> headlight housing.  And on that basis, I wouldn't considered going 
> to the 9011 (2500 lumen) high beam conversion or a wicked  low beam 
> conversion unless there is some temp data to tell me I won't be 
> melting my DOT housings.
> 
> Dave F.
> 
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Lumens is a direct measurement of LIGHT output, not heat. The total of
55W of 
energy in of the low beam is the same weather 9005 or 9011. Since there
is actually
more light output of the 9011, then there is less total HEAT (not
necessarily temperature). 
Since HEAT is what is needed to cause a temperature rise in the space
surrounding the
bulb, (i.e. heat causes a temperature change, not the other way around)
the odds are
exceptionally good that the lamp housing will actually experience less
temperature rise
than with a 9005 bulb. So, IMHO, there is little risk of melting the lamp
housing. As
soon as I figure what bulbs are in an S6/A6, I may think of trying these
bulbs. The 
$39 bulb price is a little steep, but I wouldn't mind bring up the
performance of the low 
beams/fogs. The high beams are fine. 

LL - NY