I have the AT600 (row) long style with the white/red lenses. It perfectly covers my 3 x 6 grow space. The light is solidly built and well cooled with a bank of 8 fans. The light is intensely bright and the color appears clear white like normal sunlight making it a lot easier to see if there is any foliage problems going on compared to the more common purple colored light from led's during flowering stage.

The amount of heat it puts out reminds me of the same amount you would expect from a 400w hps but nowhere near what a 1000w hps would be which is what the AT600 is suppose to replace.

It's hard to come up with anything negative about the unit but if pressed, two minor issues come to mind.

First, coming in at 65 pounds, it will require a hanger or stand system that goes beyond the "run-of-the-mill".

The other issue, which is actually more important, is that you can't change bulbs individually which would be really nice instead of having to send in the unit for service considering the weight of the unit.

That aside, without a question the light deserves the 5 stars I gave it.