I'm just passing on knowledge, don't care if you buy from them or not , I own many of there lights and they do work well , if you price a Cree 128 to build yourself, you might as well buy there's. I like the Cree , awesome spectrum good par , under the light , bad design being curved , now I...
I can put that 300w in a tent and test if it would make you happy :) , it will make no difference again, it's measuring the light coming from the light , not the reflection coming off the tent , all par readings are done in a tent. I'll put it in a tent to make you happy...
And measuring only...
The Cree have one of the lowest coverage area, but the best spectrum , they are not to spec. Epistar 320 is good , old style 300w are good , and reflector series are good .
Also I never said they wouldn't work , just posting results of the true spectrum and how off they are , the closer you can...
Here is the test from the Mars 300w 5w led , the cheap ones on eBay , I would recommend them over the others so far, they have the best spectrum for the money.