Mercury Vapor Light Question

[Nubs]

Hello, If I get a mercury vapor light with the uvb in it, do I still need another uvb light in the tank? How often does the mercury vapor light last with the uvb? Do I need to change that bulb every six months? TIA,

 

[PatsyB]

A MVB bulb takes care of your heat and UVB. I don't really know too much about MVB bulbs because I don't use them. I know some people have used them and swear by them. I like my UVB to cover a bigger area of the tank.