On Fri, 11 Jan 2008 13:18:19 -0000 Whisky-dave wrote :
A lot of the heat generated in a bulb is in the filament and doesn't
get passed on very far even though the glass gets quite hot, there's
not usualy enough air circulation to take theheat from the bulb.

If that were so, the bulb would just get hotter and hotter!

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk