Cheap thrills for reef nerds

[BrainVat]

I don't notice any heat difference. They definitely are dimmer (you can hardly tell they are on when other lights are on) but they will induce your corals to produce defensive pigments. These reflect UV light back at a visible wavelength. One of my brain corals goes bright blue when the blacklight is on by itself. The glow emitted from that one coral is enough to make the rest of the tank visible with the other lights off.