Quote Originally Posted by ledgrowtester
The manufacturer says in series not parallel.

Apparently the increase per lamp is about 3 degrees in the type of one kit system we are using. The advice they give is that you increase the water flow as you increase the number of lights in series. The water pressure with this one kit is really low. Obviously the thermal transfer ability of your cooling technique (water basin in this set-up) has to increase with the number of lights.
Yeah actually I noticed it being in "series" on the manufacturers site... which pretty much ruins the whole "counterflow design" that everything else uses! It's probably better in parallel atleast thats how I'd hook it up despite their reccomendations. if your water level is decreasing or evaporating then the water must be too hot. You could always use city water and a drain to cool the lights but thats just wasting water... a chiller is the way too go

does it come with a water regulator?

can you post pics of your harvest? im very interested, been at this light a lil too long.... thanks