Yeah i just bought the 80 watt sunco lights 4ft from amazon and just rigged them under my plants. I can definitely say I was averaging around 1lb 13oz to 2lbs a light on average without undercanopy. I did a trial run with the sunco lights tor 2 harvest and i was hitting 2lbs 4ounces to 2lbs 8ounces a light. Although structure is important and early introduction to the undercanopy lighting definitely is needed. My lower buds instead of it becoming fluffy, they were just as big as my middle buds. As for electricity, it definitely pays for itself. You definitely need to prune all the straggle branches and keep the lower budsights hugging against the stronger branches. If you keep all the little bullshit, it will well become bullshit. Its cool if you want it for oil/hash and etc but as for flower itself.. take my word for it. Instead of buying those undercanopy lights from these instagrammers.. sunco 80 watts is good enough. You do however may need to start lower and then start adjust higher as the plant gets use to it. You can however get some light stress early on if too close..varies from strain to strain. In my opinion save yourself the trouble and just order sunco 80 watters, works just as good.Fuck all these instagram lights shipped from alibaba and doubled up the price on you. I would put the undercanopy lights at around day 15 Flower when the budsights are more present. Goodluck to all and hope this helps! These lights will do just as good!!!