I'm not against water cooling. I'm actually interested in passive cooling which would be the best in a cold climate.
I guess I just assumed you were flowing it against the bulb, in that video they were
Crystal sheet glass......never heard of it...and I'm a skeptic, have any references for that data?
I don't move my lights that much, but veg in a different spot
How low would your RH go?
You should be able to seal your duct\hood. Maybe a smoke candle might help.
- Jiji