I guess they use Alumina or some other oxide. It sure cant be anything electrically conductive
The reflector may be not too efficeint, compared to what ? If not the reflector, then the light will have to be reflected from something else like the lantern's gear cover, the room ceiling, and so on. Depending on their finish and distance (the lantern may be suspended low under the ceiling), they may or may not be better than the internal reflector
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