water-cooled system runs about $200.00 more than a air cooled system. Remember no venting /exhausting the room. it is self contained.

Just inches from the bulb ,my temp 77 degrees. So my plants are 6 inches from the bulb. (problaby they will get even closer). More growth= more yield at harvest.

I use RO water in my system. I installed a window air conditioner to maintain temp, plus takes care of co2

During the veg cycle, 18/6 I freeze 2 and 3 liter plastic bottles and place them in water reservior to cool it. In flower cycle 12/12 no need because light goes out at 12 hours, and cools it self..,. Remember leave water cooling system running, even when light is out.