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

On Sun, 6 Jul 2008 15:18:28 +0100, "Arfa Daily"
<arfa.daily@[EMAIL PROTECTED]
> wrote:

>
>"Jeff Liebermann" <jeffl@[EMAIL PROTECTED]
> wrote in message 
>news:tbf0745m65iugupkjtnnasnbe2vf777j6q@[EMAIL PROTECTED]
>> 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.
>
>You're mis-understanding me, I think. I'm not using a 75 or 100 watt
bulb. 
>I'm using a 60 watt bulb, as specified for the lamp, and always have
done. 
>Up until now, they have always been the 'standard' tennis ball sized
type. 
>The smaller ones that I have been buying lately, are still rated at 60 
>watts, but in my opinion, put out the *heat* of a standard-sized 100 watt

>bulb.

Sorry.  I misread your comments.  I'm not sure where I got the 75 to
100 watt bulb.

Despite my screwup, the rest is still applicable.  Did you read:
<http://rabi.phys.virginia.edu/HTW/page1.php?QNum=1042>
If the smaller bulbs are halogen filled, that would explain the
increased temperature.

Also, note that the easiest way to increase the temperature of a light
bulb surface is to simply decrease the surface area of the bulb.  It's
exactly like a heat sink.  If you have a heat source that beleches
some number of watts, a large surface area will be cooler than a small
surface area.  Since the article indicates that halogen bulbs REQUIRE
a much hotter bulb temperature, a smaller bulb diameter, with a
corresponding smaller surface area, will be the way to accomplish
that.  Methinks it all fits.

-- 
Jeff Liebermann     jeffl@[EMAIL PROTECTED]
 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558