The light is cheap in price & uses quality components. Same components big name companies use- minus the price tag. Have a 10x10 area with 4 SF4K’s and I am MORE then happy w the end results. Really grew some quality stuff.. fire top shelf! Grew in the same area with 5 1000w lights and got same yield/results.. 5000w JUST on the lights!  The future is here ,  Low energy cost , intense lighting , sleek design , amazing Top shelf yields .. 

I was using old school halogen lamps before I switched to the SF-4000 system. I was immediately impressed with the quality of the system. It's light weight and easy to install and get growing. I ended up getting a second unit and have had no complaints. These lights really do the job for my indoor grow. I highly recommend them.

I was a little skeptical at first. I can honestly say I actually saw tremendous growth in my plants after only 4 hours of changing to this light. And daily, its now a pleasure to go take a peek and see how they have grown overnight !If you have any hesitation, DON'T this light is AWESOME !!

Really efficient to manage the temperature. The light pénétration is a little bit lower if you compare to an hps. Otherwise it really works well. Nothing to complain. And the bouton to adjust light power is just perfect.