nimrodess Posted August 4, 2005 Share Posted August 4, 2005 Ok, this may sound like a strange question but how hot does a 40watt bulb get on the glass part of the bulb. I am needing to know what the maximum temperature would be. Guesses are welcome too as I have no idea. Link to comment Share on other sites More sharing options...
YT2095 Posted August 4, 2005 Share Posted August 4, 2005 impossible to determine without other factors being taken into consideration. Link to comment Share on other sites More sharing options...
MulderMan Posted August 4, 2005 Share Posted August 4, 2005 do an experiment! Link to comment Share on other sites More sharing options...
NeonBlack Posted August 4, 2005 Share Posted August 4, 2005 I remember when I was young I tried this "experiment" I held an outdoor thermometer up to a bulb in a lamp and ended up with broken glass all over. Link to comment Share on other sites More sharing options...
some nerd Posted August 4, 2005 Share Posted August 4, 2005 It will be pretty hot if it is incandescent (I cant give number though) but if it Fluroescent bulb then may be just room temp.. Link to comment Share on other sites More sharing options...
5614 Posted August 5, 2005 Share Posted August 5, 2005 A big factor will be how long the light has been on for, it starts off at room temp! Also stuff like is it enclosed in a box or in the open so heat can disperse quicker. Link to comment Share on other sites More sharing options...
YT2095 Posted August 5, 2005 Share Posted August 5, 2005 and how far is the glass from the heating fillament and what gas is used inside, all these things are critical for a correct answer. anyway, why not, as suggested, get a cooks thermometer and test this yourself? Link to comment Share on other sites More sharing options...
danny8522003 Posted August 5, 2005 Share Posted August 5, 2005 I held a digital thermometer up to a 40w reflector lamp once and it went above 150 degrees C before i got bored lol. Link to comment Share on other sites More sharing options...
najib Posted August 5, 2005 Share Posted August 5, 2005 - use a thermocouple prob (K TYPE) connected to a digital multimeter. - rotate the multimter selector to "temp" position.( you can select either °F or °C ) - put the prob on the bulb and see the display of multimeter rising progressively. - you can draw a "temperature to time" curve. Link to comment Share on other sites More sharing options...
swansont Posted August 6, 2005 Share Posted August 6, 2005 Ok, this may sound like a strange question but how hot does a 40watt bulb get on the glass part of the bulb. I am needing to know what the maximum temperature would be. Guesses are welcome too as I have no idea. Here is the equation for radiative heat transfer. Temperature must be in K, and you need the area of the bulb. You'll get the temperature assuming no conduction or convection, which is the max theoretical value. Link to comment Share on other sites More sharing options...
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