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Cool! What kind of voltage ranges are we talking, and how toxic is Zinc sulfide phosphor?

Not that toxic, unless inhaled (take precautions) or ingested, or heated to high temperature, which produces a toxic gas.

Doping of course can change that.

May require 100+ V AC at 500-2000 Hz. So probably not the right element to implement 4k in! Or for an early education science experiment, unfortunately.

I don't know what the currents would be, proportions or dimensions of epoxy, or much else. Some more research would be required. But in terms of resistive heating creating gas: measure and be careful!

Seems within reach of a hobbyist maker, at least the slightly unhinged kind (in the best meaning). Since considerable energy is needed but also avoiding excessive heating, integrating temperature measurement into the bulb might be prudent. Or at the very least having regulation on current+voltage. There might be risk of thermal runaway, if conductivity goes up when voltage is applied to the epoxy mixture.

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