It would sure be nice to find some kind of pressure switch you could put inline with the water from the pump so that if the water isn't flowing the light power is cut. Would have saved you one unit already... There has to be some kind of suitable switch you guys could use or something else inventive for that same safety feature. Cheap insurance.
I have one installed, thing is, I was going in with the intention of rewiring everything into my room automation controller. I disconnetced everything, including the flow switch., which normally is wired to a relay. In my automation system it is digitally controlled and had already had the leads moved over.
i was working away when i thought, "Damn it's getting cold in here, that hps will warm things up in here and fired it up, I realized about 1 hour later the error of my ways and plugged the pump in. cold water and hot glass and CRACK!
these water cooled lights are nomally sold with the "no flow no go" valve
Theses are not included in the package and cost upwards to 200. I bought the switch for 80 and wired my own relay. I have seen .5" flow switches on ebay that look much more industrial than the liquid lumens one that I bought although the one I have is very robust.