Uv security light?

[cwatkins]

Originally Posted by dunl

Okay, that makes sense, but don't MH light put out at least some UV light? It's about an 8" long bulb, very small....I figured it might be a nice moonlight. Especially when I have seen some freshwater people do this.

Single ended MH bulbs have UV shielded glass in the bulb, and double ended MH bulbs don't but require the installation of UV shielded glass below the bulb to prevent UV from making it to the tank.