i have 6 70watt grow lights which are a light blueish purple .. total output of watts is 420 and my plant is about 8 inches tall for week 3 1/2 is this straight ?
i would say there not as efficent as the hps bulbs but if ur low on cash they do the trick my white widow plant looks health but i have over watered a little .. the only thing is that you need to keep the lights somewhat close to the plant about 1ft. and constantly raise it as it grows