Hello I have been doing work with LEDS and at first almost through them against the wall.
1)they do not and will not replace hps for flower
2)The coverage area is small and watt per watt a MH has way better coverage meaning cheaper. watt per sq inch of growable space
so they cost more at first, and in the long run they will use more wattage per sq inch.
useless? hmm maybe not!
Even though they are not the new cheap running growing lights they are hyped to be, they have there specilized purposes for advanced growing in the veggative stage.
Including bushy compact structure
and robustness of flavor terpenes.
you can click on my image and go to see a photo album LED VEG OVEN or go to my thread and fOllow the week by week updates of the LED VEG OVEN
3 WEEKS
ROUND 2 JUST STARTED
MH VS LED SAME STAIN (master kush)CLONEs EQUAL ROOT STRUCTURE AND SIZE AFTER CLONNER
first MH taller lanker
Then LED COMBO shorter bushy