as for bright.. plants and humans take in light differently.. HO full spectrum T5's are nice for veg.. my 4 24watt 2 foot HO full spectrum lights veg some nice plants..

last year I had 60+ clones under them and 2 grolux 40watt wide spectrum bulbs. They had no problem and most reached 6-8 inch's in 5-6 week's.. the ones under the grolux were a darker green and the ones under the T5's were a much brighter green..

and this year I started all my veggies and 5 plants under just the 4 T5's and they rocked... especially after i took out the veggies..

spectrum is more important then lumens i think..