If I had known it would lead to putting motherboards in the oven I wouldn't have opened my fool mouth.
I would hazard a guess that the nichrome elements themselves don't wear out, but only fail when resistance at whatever
point becomes too high and they burn out.
Quartz glass however may become less emissive over time/heating cycles. I could be completely wrong on that.
FWIW the Calmat bulbs that are $700 each are the jam. Way faster than any nichrome style. At the price of a new
flash to replace a set though the performance becomes questionable. Energy savings are probably significant however.
Do incandescent bulbs become dimmer over time?