There is no way that an AT-600 will be too much light @ 12" let alone 36"..... This is false and bullshit information that for some reason continues to be spread. I am running 600w of CXB3590 6-8" in a 4x4 area from my tops and have no light bleaching. You are telling me that AT-600 is more intense? At 36" no less? Company paid shills say this kind of bullshit nonsense.A friend just did the Apache at-600 vs the 1000 watt de nanolux and they came out close. The Apache bud was frostier though. He told me you need at least 3 ft of distance too or it will bleach the tops. Even my gavitas aren't that intense. But the Apache is running at like 600 watts. I just recently tried the cheapies and they did good for a small grow. I use the LEDs too to clone with and veg now too before they go to the metal halides but even those I'm debating switching at some point
They run the light at 36" cuz the light coverage SUCKS, no other reason.