Stick it on a speaker stand, to decouple it ( acoustically) from the floor joists.

Ya might try just getting it off of the big soundbox ( orange crate).

If it's older, try unplugging it for several hours ( to allow cap charge to disappate) and tightening up the transformer plates- they'll loosen over a few years.

Also worth checking to see if you're hearing overvoltage @ the trans due to insufficent bulb resistance- ie, cheap or old bulb. Will accentuate 60hz.
rhizome Reviewed by rhizome on . quick Question about grow room set up HELP i am having a problem with my set up i have the intake from outsite at the top of the "cold room" and the exhaust on the wall firing into my "2nd" room. now the issue i am having is i am getting light out my intake during the night time. i have a manifold blocking off all the light. then a hole cut in the wood to fit in my aluminum sheet metal adapter which goes to 4" then i have on the white flex 4". setup like a 90. i taped a black garbage bag around the white 4" flex not know if thats Rating: 5