Didn't think I needed them, but it was raining just before my last harvest and got some bud rot. So its one more thing to buy. The water cooled fixtures really help with the heat but the girls put allot of water in the air.
Growing is a hobby for me, so I've been playing around with measuring lumen's at different angles, etc. Was told that I really needed to use RO water for the water cooled fixture to get as much light output as possible. So I measured the light with some old water in it and drained it out with the light on and the lumen's were almost unchanged. It appears the 2 glass tubes is the biggest factor in the attenuation of light in the these fixtures.
Temperature and water flow sensors on your light chiller system are a real good thing to have in case of pump/chiller failure or if a circuit breaker pops on your pump or pilot error. It doesn't take long for your lights to cook.
It seems to be way more efficient to keep the heat and infrared light out of the grow room by using the water cooled fixtures. But humidity may still be a problem to be dealt with.
Your grow is exactly what I wanted to do, so my eyes are glued to the tube, waiting for the next set of pictures.
Thanks my Brother!!
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