i grew with 2 1000 watt hps...digital ballasts and hortilux bubls and my yields are very close and my meds are stronger...whats to figure out?

i don't need science to tell me my plants are healthier and producing better meds...there are a few folks on here who may be able to explain your question but again my results tell me everything. you are welcome to look at my albums and grow log. :hippy:

plus i am only growing with half the power i did from before and no heat to worry about or cooling!:jointsmile: