[TR] Comparison of headlamp current draw.

[spamiam at comcast.net]

Randall,

I just checked my TR4/4A workshop manual.  It lists RHD Home market bulbs as 
60/36 watts.  For left hand drive, it is either 36/36 or 45/40.  So, my 
measurement of 46/37 is pretty close to the higher standard rating.  As I 
said, I believe these are the original bulbs from 1967, and probably had 
more use of lows than highs, resulting in a slight diminishment of the low 
beam power....

-Tony

-----Original Message----- 
>From: Randall
>Sent: Monday, April 11, 2011 9:27 PM
>To: spamiam at comcast.net
>Subject: RE: [TR] Comparison of headlamp current draw.
>
>Current (and output) does go down with time for tungsten bulbs.  The
>filament literally evaporates!  I've seen old Lucas dash bulbs where the
>glass was completely black from all the tungsten deposited on it.
>
>But the late TR3A/B owner's manual gives the spec as 36/36 watts, for "dip
>right" (aka LHS) export cars; so your bulbs may have still been operating
>close to their design point.
>
>-- Randall