It’s worth noting that this is an art/design project, rather than something intended for practical use. It would actually be remarkably dangerous to have one of those running for any length of time with a tungsten bulb, or any other bulb that’s putting out more than a very low level of heat. They’d melt and/or burst into flames. And as lights, the black interior of the cone would eat most of the light the bulb generates radically reducing it’s efficiency.
I do love the concept though.
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