Re: Slightly OT. Heat and a Bench Light ...

On Sun, 6 Jul 2008 02:08:27 +0100, "Arfa Daily"
<arfa.daily@[EMAIL PROTECTED]
> wrote:

>Potential fire hazard, or am 
>I just being paranoid ? Does this need bringing to someone's attention ?

You might have a point, however I find it odd that you're using a 75
or 100 watt incandescent bulb in a desk lamp.  I have a few here and
they all specify 60 watts maximum.  I guess that applies only to the
old large bulbs.

This is probably what's happening:
<http://rabi.phys.virginia.edu/HTW/page1.php?QNum=1042>
Yeah, looks about right.

Wanna disclose the maker and model number of the hot bulb?

<http://rabi.phys.virginia.edu/HTW/incandescent_light_bulbs.html>
Candle flame  = 1700 C
Match         = 2000 C peak
100 watt bulb = 2500 C

Are a few degrees C going to make much of a difference?  I don't have
the proper IR thermometer necessary to measure such high temperatures.
See if you can beg or borrow an optical pyrometer used in a steel mill
or foundry, you can measure the temperatures.  Forget about using
thermocouples as they don't cover the temperature range:
<http://en.wikipedia.org/wiki/Thermocouple>

Meanwhile, use an IR optical thermometer to measure the temperature of
the lamp shade, to see if it's ready to ignite.  Compare the old and
new bulbs.  A few measurements will tell you if you're in danger of
burning the house down.  Judging from the description of how a Halogen
bulb works, I suspect you have a justifiable concern.



-- 
Jeff Liebermann     jeffl@[EMAIL PROTECTED]
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