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Is it incandescent!? I would have expected an led, or at least a process improvement where it was replaced by an led.

It’s still an incandescent, unfortunately. If they changed it to an LED, it might be bright enough to be useful.

Allegedly, it's LED now:

'The small light bulb was replaced by a LED diode, but the intensity of the tired firefly remained'

I wear F-91W every day and FWIW, the light is adequate to see time at night.