Condensation on duct work, insulated that now light was soaking wet and dripping

Hi to all, have learned tons here. Mostly that when one issue is solved another pops up.

I live in the cold, 10-15 at night, 50 during the winter days. In the garage is a sealed 4x4 flower room running co2 that gets to 60+ humidity during the light but has a fan pulling that to approx 20% at dark with fresh air. 600w hps. I run the light at night to keep the room warmer without as much heater, it pulls in cold air from the top of the garage through the light then out into the attic. Initially the intake duct was getting condensation so I ran a R9 insulated duct and problem solved. Next the tube out of the light was building up condensation as the temps here got colder so I put the same insulated ducting on that.

This morning 95 degrees and the light housing was soaking and dripping all over the room/girls. I'm thinking the tube after the light was transferring the cold air into the room now the insulation has changed that and why it was warmer. What do I do about the water??? I have a 6" maxx fan on the lowest setting and the light isn't warming the air at all.

Can I block off some of the intake or will that over heat the fan??? The heaters are in the rooms, flower and veg with a dead space in the middle that has a demand heater to help the free flow air running into the veg room a little warmer. Last time I pulled air from the middle room my heating, electric, went up approx $150 and took the veg room to barely 72 degrees.

Any ideas? Tried a rheostat on the maxxfan but didn't work, I can't figure how to run it slower except to restrict (block part of) the intake but don't want to kill the fan.

Thanks!

i have no idea but that fucking blows, dehumidifier?

Need to make the temperature of the air outside more similar to the temp inside the tent? Like when you have a sweaty toilet you add a little warm water to the water line.

Thanks so far, I was on the high setting for the fan, left over from the summer, went to low but temp was knocking at 100. Tried medium and about 1/3rd go the condensation remained. I think ill try low tonight.
Thanks

What are your room temps? Could you get away with not running cold air through your reflector? I have similar temps except days only get to 20-30 and I NEED that extra heat, i'm also exhausting 24/7 and you're not, but I still struggle to keep heat and its only going to get colder. Thats the issue though. Hot room, cold air running through the reflector, condensation forms on the outside of what is cold.

You have a cold can of soda that was dry when you took it out the fridge. You put it on the table of your 90 degree room and after 5 minutes you'll see tons of water on the surface of the cold soda can and all over the table. Same thing thats happening.

I have a oil radiator heater that has a digital reading and thermostat, about $80 at the depot. It seems to be freaking out a little, maybe just its position near the door. I have turned the fan to low, was still about 1/5 of the top of the light wet, the part away from the light. the weird thing is the radiator heater was cranking, hit 102 last night, the thermometer pickup was in direct light and the plants look good. I think the co2 helps with that. Plan is to rearrange the room and the heater thermostat away from the door (can't imagine a leak, co2 lasts about a month) and run at low.

If you think about the heating costs a co2 setup and sealing the room might save $$$ and increase the production???
I'll keep this updated!

Oh yeah, the temps were about 69-85 before the latest insulated duct, now 78-95ish. I vent with a y off the veg room fan and an automatic damper rigged to a humidity sensor switch to run it down to 25%. On an opposite timer than the light and co2 stuff. Also with a passive spring loaded damper going into the room

Id source air for the reflectors from another room in the house and still dump into the attic. I think this will solve the condensation issues.

I would wrap copper plumbing around your intake duct, and run it to your water heater. Then run the other end back to your house supply pipe. At night, trickle your hot water, and you'll be pre-heating your intake air. JUST PLAYING AROUND. We're not tweakers here.

The only thing that coms to mind would be a line heater, but that would be silly. I thing firstimeARE had the best idea. Use intake air from your house, run it through the hood, then vent it into the garage, or back into the same room for added heat and no HVAC vacuum.

Funny ass story! A grow room in NorCal was using air from a bedroom to cool lights and returned it for heat. During the summer, they would source the air from under the house. This created quite a pressurized house. My friend and I are leaving carrying roughneck totes, and the door literally hit my buddy where the sun don't shine. It was with such force, that my buddy, and the contents of the container went spilling into the driveway. After scraping himself off the floor, and feeling stupid for blooding his own nose, he collected the parts and counted his blessings that no one else saw!

Now we always have in and out.

If in is fresh, out is fresh,lol!