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
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