That's what I thought. IIRC, there is tungsten inside and over time it ablates off and deposits on the inside of the bulb. That's the dark discoloration which occurs in the bulb. The more robust you make it the more it shifts the spectrum to IR, and so on...
That's what I thought. IIRC, there is tungsten inside and over time it ablates off and deposits on the inside of the bulb. That's the dark discoloration which occurs in the bulb. The more robust you make it the more it shifts the spectrum to IR, and so on...
Filament boil-off does decrease the light output as well. You're right, that's the dark-silvery coating on the inside of a bulb, that's metal that's boiled off the filament. It's a neat effect, but not a useful one if you want light bulbs.
Little high-output bulbs are more susceptible to it. I assume probably due to the high drive levels and size of the envelope.
Filament boil-off does decrease the light output as well. You're right, that's the dark-silvery coating on the inside of a bulb, that's metal that's boiled off the filament. It's a neat effect, but not a useful one if you want light bulbs.
Little high-output bulbs are more susceptible to it. I assume probably due to the high drive levels and size of the envelope.
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