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Old 11-29-2009, 01:25 PM   #6
sharkojoints
is a bit slow sometimes..
 
Joined: Jul 2009
Location: Under a rain cloud, UK
Oddometer: 72
As far as I know, it's the 'BA9' bit which matters: it describes the length and type of bayonet cap on the bulb.

The Snowbum page does give the usual torrent of advice - maybe you can work out which one you prefer from it.

I thought the 20w one I bought above was pretty cheap. Less than $10, anyway!
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