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ok i gave it a shot. good info esp discounting everything below the common cheap 600 SE. so many expensive LEDs right around there! im leery at drawing conclusions from his data as he doesnt qualify the measurement technique. he specifically mentions the QB120 was measured in a 2x2 tent -...

theres no better. depends what current you want the cobs to operate at

yeah those CFLs arent that efficient and would give you a better heat/light ratio as well as some UV you can even use the reptile CFLs for more uv but if doing that, put them on a seaprate switch and turn em off if working in the room

not sure i want to spend time watching any 2018 study that includes CFLs

i like the vertical hps bulb idea. 70 watters arent that efficient and put out more heat relative to light

too much light in too cold conditions is a nightmare, you will suffer uptake issues of secondary nutrients and low metabolic rate from the plants

you know thats been done over and over and over, right? growmau5 did video after video with full metrics on g/W, g/SF, and g/kWH over flowering cycle there have been literally too many growers to count here who have reported exceeding 1.2 g/W routinely. The best do 1.7 g/W and up

the 1812s will be brighter than a 1212 at same current so space accordingly

because lumens are for humans, plants like PAR, and certain ranges are more absorbable than others, so not allPAR is even the same lumen is a green-centic measurement and is not very useful when comapring different spectrums

take down one of the lights and put one on a mover and yield about the same

buy an HPS

is he yielding 3 lbs out of that space with his 1200W? optimal would be a fraction of the light or larger space

2x600W single ended? 1200W is a lot of light for that space, 120W/SF

sorry you lumped my info in with other peoples opinions. the efficiency spec i posted is just a fact, i offered no opinions on the light

im not skewering anything, as youve shown they grow great product. just wanted to relay the fundamental concept of efficiency to you

ok tunable spectrum makes sense. intensity without the heat really doesnt because both that light and an hps are 1.3 umol/J, so theres no advantage there

so whats your motivation to use LED over the greatly reduced cost of HPS?

"50%-70% overall energy savings" vs what? T12 lol whats even funnier "mj12led@thc_connect that’s okay. I knew this day was coming. The factory I deal with promised me they wouldn’t sell my design to anyone else, but looks like they went behind my back. Either way this light uses 4 less COB’s...

so thats a xl1000(750W) and an xl750 (430W)?

what wattage?