Do light bulbs contain mercury

florescent lamps have Mercury

the mercury plasma has three bright bands in uv to make the phosphors floresse

incandescent lamps have thorium allowed with tungsten so the tungsten doesent melt

LEDs have nice stuff like gallium and arsenic for particular jumps in atomic shells at the active layer

Neon lamps are sort of benign

Gaslights use methane but to be bright you add a mantle with thorium wire

perhaps a lime light is the answer

carbon arc is another benign light source