Quote:
Originally Posted by chexi4 
All pjs (except perhaps Infocus) say this. I do not understand it. I understand why you run a fan when the lamp is on, but why do you need to continue to cool it when you turn it off? As soon as the element is turned off, there is no more energy going to it. If the fan cooled lamp is say 150 degrees when on, the instant you turn it off it should start cooling (on its own and without a fan) as no more energy is being applied to the bulb. It should not rise in temperature with no energy or heat source acting on it. It will cool slower than with a fan, but according to a number of people, that is a good thing. Take a pyrex dish out of hot oven and cool it quickly with cold water... it will shatter. I don't see how this is any different than rapidly cooling a light bulb.

All pjs (except perhaps Infocus) say this. I do not understand it. I understand why you run a fan when the lamp is on, but why do you need to continue to cool it when you turn it off? As soon as the element is turned off, there is no more energy going to it. If the fan cooled lamp is say 150 degrees when on, the instant you turn it off it should start cooling (on its own and without a fan) as no more energy is being applied to the bulb. It should not rise in temperature with no energy or heat source acting on it. It will cool slower than with a fan, but according to a number of people, that is a good thing. Take a pyrex dish out of hot oven and cool it quickly with cold water... it will shatter. I don't see how this is any different than rapidly cooling a light bulb.
Once the fan is off the bulb will continue to release heat until it cools down.
W/o fan running the PJ's case interior have more heat gain than heat less so the net heat energy within the box will increase rising the temp. Overtime this persumeabley would damage the electronics. But the main reason (IMO) for the fan to cool down the lamp after shut-off is to get the lamp ready for another power up in case if it is needed.

























) except for the screen so I may have to setup a temporary theater in my bedroom sitting area and start enjoying it.


