Awasome Lights That Are Black References. Web updated on december 01, 2019 there are a lot of everyday materials that fluoresce or glow when placed under a black light. The energy emitted by these lamps is measured in watts, while the specific wavelength of ultraviolet light is measured in nm.
You can't see this part of the spectrum, which is how black lights got their name. Web mount etna eruption lights up the night sky. The other name for it is ultraviolet (uv) light.
