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Filament bulb to heat PCB enclosure

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EEEnthusiast:
Friends,
I am in need for a heat source for my PCB which is enclosed in a metal case. The heat source needs to be controlled using an ON-OFF control using a MOSFET. I was looking at adding a large power resistor, then it stuck me that I could use a filament bulb as well. The objective is to heat the air inside the enclosure, in order to maintain a constant temperature which is higher than the ambient.

Does anyone has experience using a filament bulb for this purpose? Any drawbacks using this idea?
I plan to use a 12V bulb powered by a 5V source, so that the bulbs life time is extended.

thanks

mikeselectricstuff:
What benefit would the bulb have over a resistor?

EEEnthusiast:
Well, it might add some coolness to the product in addition to the warmth.
I am wondering if the filament bulb may be a more effective radiator of heat than the resistor.

Psi:

--- Quote from: EEEnthusiast on November 19, 2019, 07:21:41 am ---Well, it might add some coolness to the product in addition to the warmth.
I am wondering if the filament bulb may be a more effective radiator of heat than the resistor.

--- End quote ---

Resistor = 100% heat
LED = 70% heat  30% light   (roughly)
LAMP = 95% heat 5% light  (roughly)

Berni:
Well a lamp does spread its heat out more because the light it is radiating turns to heat once it hits other things.

But yeah since incandescent lamps have really poor efficiency means the majority of the heating is the lamp itself rather than the light. And since lamps burn out eventually it makes more sense to just use a big power resistor instead.

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