Some electric lights run on batteries, right?
How about putting batteries in your recipes?
If it is something that consumes little power, like an LED, it can keep glowing for a long time.
I looked up LED’s, and the materials are (AlGaAs) red, (GaAsP) yellow, (AlGaN) green/blue, and (GaP) red, yellow, and green.
Gallium and arsenic are often obtained as by-products, but they have few uses, so I think they should be used for lighting materials. (This does not mean that they have no use at all).
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