When I put the 900 watt unit up, I took down one of my 300 watt Mars units. I opened the case today to clean inside, they've run daily since may. I was surprised they weren't as dirty as I'd expected, considering the environment and long running time. Even better, I got to see how they were made/assembled. I didn't remove the heatsink/leds. The upper housing holding the fans and the power supplies was very nicely done. All connections are clean and solid, all terminations enclosed in shrink tubing. Wiring was neatly laid out and all parts were solidly attached. Seeing the light internally, has increased my satisfaction with these lights. I find it to be very well made, in fact, better than I'd expected! Given the price of these, I can't see any reason to use old tech, HPS/MH lights anymore. A pair of these 300 watt units will match performance with a 600 watt MH/HPS without a doubt. If i ever feel the need to upgrade, I'll gladly continue using this brand!
The KIing 900 watt unit is also performing well. My Durrty Cheese is building up some really nice colas as she grows under this light, and that’s what its all about, making bud! Heat is not excessive, infact, I've a total of 870 true watts of LED running in the growroom, and these lights come nowhere near putting out the heat my 600 watt MH did! Last winter, I was running a window fan on high, to bring in cold air in Jan when temps were around 0F to 30F! Above 30F, I needed to run my airconditioner!!! . Now they do make some heat, but I can go all day before it will get from 73F to 85F. When it does, I just leave the door open for an hour. Think how much electricity that has saved me!
so, one a bang for the buck basis, current generation basic LED growlights have become a worthy commodity.