400 Watt Cool Tube Vent Question

My 4x4x3 tent is lit up nicely...
My DIY cool tube works perfectly... i can run my hand all across the outside of the glass comfortably. I also have around 80-90 cfm 4 inch muffin fan with 2 4 inch passive vent holes. It isnt enough. Temperatures get up to 85 within a few hours and then creep up to 90 over the course of the remainder of 18 hour schedule. Oscillating fan and all that running on the 18 too..

My question is this.....

With the cool tubed light, how many times should 48 cubic feet be replaced in a minute???


Mad props to to the gurus who work the voodoo first..

I need to order fan soon. Tight schedule with flowering and keeping door open wont be an option soon...

You gotta vent the cooltube outside of the room where the tent is or it'll just get sucked back though the intake.

UserFriendly said:

You gotta vent the cooltube outside of the room where the tent is or it'll just get sucked back though the intake.

Click to expand...

Thanks for the response, but my exhaust from both cooltube and the tent vent is into the closet where the tent is and the intake is actually from the hall, so all of the intake air is around 70-75 and the closet that the tent is in the ambient temp is only 79. I put a cool mist humidifier in there with it and it stays around 80 now, and the humidity hovers around 35. Any other help would be appreciated.

+rep for the response though.

koncyse said:

Thanks for the response, but my exhaust from both cooltube and the tent vent is into the closet where the tent is and the intake is actually from the hall, so all of the intake air is around 70-75 and the closet that the tent is in the ambient temp is only 79. I put a cool mist humidifier in there with it and it stays around 80 now, and the humidity hovers around 35. Any other help would be appreciated.

+rep for the response though.

Click to expand...

Come on bro. Where do you think the heat is coming from? I only said it would get recirculated through the intake to simplify the concept for you. I appreciate the rep, but I'd much rather you understand what's going on there.

You have a tent sitting in a hot closet because you are exhausting the light into the same fucking closet man. You have to vent the light to a place where the tent isn't. Get a grip bro. What's the point of venting the light if you're just going to half-ass it?

If you insist on playing dumb, you're not going..... fuck it.

UserFriendly said:

Come on bro. Where do you think the heat is coming from? I only said it would get recirculated through the intake to simplify the concept for you. I appreciate the rep, but I'd much rather you understand what's going on there.

You have a tent sitting in a hot closet because you are exhausting the light into the same fucking closet man. You have to vent the light to a place where the tent isn't. Get a grip bro. What's the point of venting the light if you're just going to half-ass it?

If you insist on playing dumb, you're not going..... fuck it.

Click to expand...

so heat coming out at around 78 going into a room that is around 78 is going to make the inside of the tent in said room rise to almost 90... with the door open, IN THE CLOSET, the temp stays at 78... which is the mean temperature for the
closet...
the room temperature changes maybe 2 degrees from the 18 to the 6 and thats making the tent temp rise almost 12 degrees....

its mathematically improbable but since you insist on hurling insults my way rather than common sense, i guess thats the last "help" i can expect from you...

Thanks anyway... smoke and chill man...

koncyse said:

so heat coming out at around 78 going into a room that is around 78 is going to make the inside of the tent in said room rise to almost 90... with the door open, IN THE CLOSET, the temp stays at 78... which is the mean temperature for the
closet...
the room temperature changes maybe 2 degrees from the 18 to the 6 and thats making the tent temp rise almost 12 degrees....

its mathematically improbable but since you insist on hurling insults my way rather than common sense, i guess thats the last "help" i can expect from you...

Thanks anyway... smoke and chill man...

Click to expand...

UserFriendly is correct in his assessment. I currently have an air cooled 600W light inside of my tent.

The tent is located in a room (closed with a door but has an A/C register) and the air from the light is exhausted OUT of the tent, but it is left IN the room the tent is in.

What i noticed was that unless i had the house A/C on fulltime (much too early for that yet), that I HAD to leave the door to the room cracked as the recirculating warm air pushed my temps to 87F.

The ambient air in my basement (room included is 68 ). I am getting to the point now where i can run central air (A/C) during the day, thus locking the door to the tent room whilst no one is home.


But unless your ambient air temps are in the 50's, you are going to need to exhaust that heat elsewhere.

Thankfully, once my wife knows the carbon filter works, I am venting that baby outside!

chiefthief said:

UserFriendly is correct in his assessment.

Click to expand...

koncyse said:

so heat coming out at around 78 going into a room that is around 78 is going to make the inside of the tent in said room rise to almost 90... with the door open, IN THE CLOSET, the temp stays at 78... which is the mean temperature for the
closet...
the room temperature changes maybe 2 degrees from the 18 to the 6 and thats making the tent temp rise almost 12 degrees....

its mathematically improbable but since you insist on hurling insults my way rather than common sense, i guess thats the last "help" i can expect from you...

Thanks anyway... smoke and chill man...

Click to expand...

UserFriendly said:

Where do you think the heat is coming from?

Click to expand...

Figure it out yet?

it sounds to me like the tent itself just needs a lot more ventilation. If your tent is too hot, go get an exhaust fan. Props if you can make your intake come from a cooler hallway. In my small closet the cooltube was just the beginning of the heat solution. I can run my hand on my ct too, but it still heats the surrounding significantly. In my 3x4x5 space i have a 100cfm fan running my cooltube and two 50 cfm fans running exaust, with a 400w HPS. I have a passive intake in my cab at floor level so that the coolest air in the room is being sucked in, and all exaust are at ceiling level. I am considering venting them outside this summer though, because they definetly (obviously) cause the rooms temp to rise, even though it is a large room with open windows. My plants can grow to almost touch the light, the only stuff that shows problems is the leafs if they actually touch the tube, otherwise no curl or anything. The ambient temp of the room the cab is in is 20C and the cab stays at max 25C or under depending on humidity. This works for me, even if it is tad on the hot side.

Smoke something

yes actually... i increased the ventilation.. ass... so now the air inside is the same temp, give or take a degree, as the air entering it... as it should be...

I wasn't asking anything more than what the ventilation rate should be with cool tube... as it was, it was only being vented 1 1/4 times a minute... i'm just going with the standard 5+ a minute... problem solved.....