Ultraviolet Pea

This plant uses ultraviolet light. Ultraviolet light is light at a greater frequency than what we see as violet. Our atmosphere (specifically, the ozone layer) blocks most of the ultraviolet light that reaches Earth, but if it's coming from a source on the surface, that's an entirely different story. Despite its power (and, unlike the Microwave Pea, its damage doesn't decay over the distance), certain shields can block it (Gunmetal Door and Iridium Door).