Quote Originally Posted by cornish_dope
that looks like at least a 200w or could even be a 250w should say.

I got four plants under a 125w envirolite then flowered with an hps and got a nice big stinking yield good luck mate.
Yeah here in the uk the envirolites come in 125w and 250w but i thought as the OP's first line said "FE-IIIb-105W" that the 105w related to the number of watts so they must have different wattages over there?

I've got a 125w enviro and like you i get 4 plants under it till they're ready to flower (6 at a push) but if i was gonna use one to flower i'd probably only put one under it and do a bit of LST or scrog.