Sorry if I appeared to close the "Preheating Conventionals" thread abruptly or prematurely. Please continue the (fascinating) discussion here.
This is, unfortunatly, incorrect. The resistance of the filament is not what (directly) creates light. The only function of the (low) resistance of the filament is to create heat.
Thanks, fredthe. That is what I was looking for in someone telling me I was wrong. And if I had thought about it, I probably knew that. I guess the question that still remains is: Do different lamps of the same wattage produce different amounts of heat?
That is quite easy to test, line up several fixtures with different type, but same wattage lamps and take readings at regular intervals with an IR Thermometer.Do different lamps of the same wattage produce different amounts of heat?
Makes sense. So if compared to the black body radiator theory where a body glowing at a "warmer" color temp is at a lower radiant temp compared to a "cooler" color temp, then, though the difference may be small, lamps of the same wattage but different color temps should have different radiant temps. Correct?Yes, but not always, and probably by not a significant amount.
If one filament is longer than another, then it has more capacity to produce heat simply because there is more mass heated. Take for instance a 1000W cyc light vs a 1000 watt ellipsoidal lamp.
Does that make sense?
I have an IR thermometer it can measure up to 518˚F so if that is enough range then I have lamps I can test.That is quite easy to test, line up several fixtures with different type, but same wattage lamps and take readings at regular intervals with an IR Thermometer.
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