Why has nobody asked him why he is trying to cool the light in the first place? At what point did you ask yourself should i buy a fan or mount an electrical fire to my fixture inside of a craddle? I asked lots of times never got this answer from myself, never not even one time ever has anyone put those lights where they could even get a spritz. Next they will water their grow lights to cool em down and skip the annoyingly long freezer step and just fix a soaker hose to ur hps lamps to keep temps controlled. I was planning on doing the same thing but i am going to use something much colder then water like liquid butane or propane, their sub zero temps should keep my light cool for a good long while, it most certainly will explode causing a large fire coupled with injuries from the explosion, not too mention the plants dont do well after explotion stress and the herb burns differently when it dries like that, ill have to have all my equipment and house replaced but ill see what happens after this cycle cause i have been running it like this for a few weeks dont wanna stop in the middle of a grow... if its not broke dont fix it right?
Licking the outter surface of the bulb will cool the bulb and char your tounge, to me putting ice ontop of an electrical fixture no matter how you do that is the same thing as licking your hps bulb to cool it, put the ice on n your tounge to protect it