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The current lighting technology, in all catagories (Hid, Led, Plasma ect), are all quite interesting in a mechanical engineer sort of way. It's awesome that the cannabis community is contributing real world test data for future horticultural/agricultural techniques. In that round about way...

Liked for "shekels" Yeah, riu has been pretty on it in the led section.

1 watt = 3.412 btu's You can indeed use lights to heat an area.

Get a 24 x 24 inch tray for a 3x3 tent. The size is the interior reservoir dimensions. The outside size is more like 30 x 30 inches. Or you can build a diy table from 2x4s plywood and a pond liner pretty easily.

My local hydro store carries HLG and Nextlight products. So... But a hydro store is only going to carry lights that use UL and CSA listings.

@AndromedaM31 best of luck to you mate, happy growing with whatever you decide.

I wasn't telling you to trash lights, I was simply answering the why buying a single 135w kit is better than 2 more of those vivosun units.

Part quality, quality of spectrum, intensity, efficiency, longevity, working under them (white light is much easier to work under) you also have to look at the amount of wattage that goes to the light itself, not just the fixture. If you have built in fans ect they take some of that power away...

@rob333 I'm not sure you understand what goes into various led components. I'm not sure you have any electrical experience (say putting a computer together) or any scientific research to back your opinions. I can say definitively that HID lighting has it's place. I can also definitively say that...

You need to get your second net up asap.

I'd probably use 2x 630 De cmh(or 6 315 cmh with co2) bare bulb verticle and treat it as if it were two seperate 4x4 spaces, IF you were wanting to just maximize output of the tent space.

If you aren't getting a single driver for the left over board, it would increase your efficiency and ppfd in that area, either way you'll be golden. Again if you need help on something for the build just ask.

If you are wanting to maximize the space you should look into hydroponic vertical grows.

https://www.findchips.com/search/HLG-240H-C2100a https://www.amazon.com/Horticulture-Lighting-Group-Quantum-Boards/dp/B07KQGLJWT/ref=mp_s_a_1_1?ie=UTF8&qid=1543924594&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=qb120+v2&dpPl=1&dpID=41e83UphmnL&ref=plSrch (You will use the same components...

Im thinking about doing dtw coco 9x 2 gal pots or 4x 3 gal pots for final containers. Using jacks 321, recharge and a soluble fulvic acid.

I'd probably just grab a 4 pack of the new hlg qb120 v2 and put together a fixture for about $240 diy. If you want to go this route just hit me up.

2x 315 cmh or a single 600w hps vert is the best way to maximize light coverage on those low wattage needs. Might want to check out the vertical section or look through youtube.

https://www.owenscorning.com/insulation/products/foamular-250 You can use this to insulate basement floors enough for furniture even without a plywood overlay. 250 psi ridgid foam. You could even grab a higher psi rating but it's probably unnessisary. I can jump on foamular 250 without...

Mephesto has a reputation for doing really great autos. I'd suggest throwing that stomper in.

Bth, in a sealed room, your dehu/ac is going to run a hefty amount unless you are running air cooled lights. And even then they still run quite a bit, if it's an issue it might be more beneficial for you to look at ventilation first before deciding to switch lights up.