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High Temp Power indicator (>110C)
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voltsandjolts:

--- Quote from: SiliconWizard on March 29, 2022, 05:40:53 pm ---
--- Quote from: voltsandjolts on March 18, 2022, 04:42:10 pm ---LEDs work fine at 150C+
Don't worry about specifications :P

--- End quote ---

Uh. Yeah sure. They do work. The question is, for how long.

--- End quote ---

The answer is at least 6 months @150C for the random types I use, nothing fancy.
The OP is looking for 110-120C operation which is a walk in the park, will last way longer.
voltsandjolts:

--- Quote from: DavidAlfa on March 29, 2022, 05:00:02 pm ---The highest temperature parts are usually rated for 125ºC, so I there must be a colder zone elsewhere for electronics?
If so, maybe you could use fiber optics?
Otherwise, what kind of electronics are you using? 150ºC rated parts are very rare!

--- End quote ---

The manufacturer ratings are conservative, many parts work far above their temperature specification although with reduced lifetime. e.g. some PIC MCUs rated for 85C work surprisingly well at 200C for a couple of months. You can buy MCUs rated for 200C but they are hundreds of dollars and are often overkill for some applications. Long-term high temperature testing is needed to find which parts can reliably meet lifetime and temperature requirements. The applications I target are battery powered and hence lifetime of battery (at 150-200C) limits the useful life of the system, hence lifetime requirements of semiconductors (these are one-time use products anyway).
Zero999:
A couple of transistors and a transformer can be used to generate 120V from 28V, but why bother? Use an incandescent lamp. High temperature silicone and fibreglass can be used for insulation.
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