Hi Art. Doing some reading it seems COB LEDs can be good for up to maybe 180 degF, while regular package LEDs maybe a bit less. LEDs apparently also get dimmer with heat. Even on the other side of the oven wall through a glass lens it's likely still too hot. I'm thinking maybe a cluster of a few LEDs on the control board through fibre optics to a domed lens could work. They'd probably have to use expensive all silica fibre which can apparently go above 1100 degF, rather than poly coat fibre only good for maybe 575 degF unless they use a through the wall glass dome. As long as you can get 40 watt incandescent or halogen heat rated appliance bulbs for cheap, including the odd dollar store, then I don't imagine there's any engineers staying up late working on this at the moment. Thinking of LED bulbs, I've got an LED bulb in my old trouble light and no longer have to worry about dropping or knocking it. Last night working under the hood I'd probably have broken three incandescents.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now