
I bought them for lighting. I am 3D printer where a lightbulb illuminates the plastic sheets. They work because they don't get hot enough to melt or deform the plastic sheets, and they fit a standard US lamp socket. They have good brightness and correctly illuminate lithophane even in normal room lighting. However, they can be too bright to use in a lithophane night light as they can make the room too bright for sleeping. But it's really a personal call.

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