I'm working on a 30X24X48" tall enclosure that will have 4 24" T5 bulbs. I have the fixtures left over from a previous project. Do they all need to be UVB bulbs or only half of them?
Jim
Nope, Definitely NOT all UV.
I would suggest 2 6% Arcadia bulbs, spaced out, or one 12% Arcadia bulb.
The rest could be good quality full spectrum 6.5K bulbs.
Or ONE Arcadia Plant Pro bulb and the rest full spectrum 6.5k.
Cheers
Todd