"The Natural Philosopher" wrote in message
...
whisky-dave wrote:
"The Natural Philosopher" wrote in message
...
whisky-dave wrote:
"Tony Bryer" wrote in message
...
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!
It does that's why you usually can't remove an incandescant bulb from
it's
holder/socket until it's been off a while. Which isn't such a problem
with CFL or
LEDs.



Oh dear. Oh dear oh dear.

So if the heat can't escape, how does it cool down, ever?

Where did I say it can't escape ?


He

"not usualy enough air circulation to take theheat from the bulb."

Nowhere do I see the term the heat can't escape.
The heat can escape but not always from the glass bulb, some escapes
via the actual connector being metal and being a better conductor of heat
than the glass. Remmebr too that there's radiation , conduction and
convection
that can remove heat from anything.
Standard incandescent bulbs aren't the best option for heating. But I've
also used
photoflood lighting and you can get quite toasty standing in front of
those,
but there still not as good as a dedicated heater.