My New Closet Grow Room!!! New Tips!!!

600W HPS Light, the fans are just $12 ventilation bathroom fans from home depot, with one being used as exhaust to suck hot air out, and one box fan over the light. My temp is still at like 98. Any suggestions? No plants yet obviously so i'll worry about humidity later, but I want to make sure its not to hot before getting baby clones in there. When the closet doors are on its completely lined with the shiny white material purchased from the hydro store.

bathroom fans from home depot, with one being used as exhaust to suck hot air out, and one box fan over the light. My temp is still at like 98. Any suggestions? No plants yet obviously so i'll worry about humidity later, but I want to make sure its not to hot before getting baby clones in there

You may want to change the fan set up.

Thirty degree curve (In the duct) cuts up to 20% air flow, forty-five degree cuts up to 40%, 90 degree angle cuts up to 60%. -'Marijuana Horticulture Indoor/outdoor Medical Growers bible' by Jorge Cevantes

the fan on the back wall is really twisted up, you may want to try and get it as staight as possible.

I have mine going straight down the side of the wall from the left side of the lamp to the floor(wall mounted fan blowing on the rightside towards the exhaust intake), through the fan then straight into the outside room to maximize my fan. This way i can move the air around the bulb out of the room almost as fast as my 1000 watt hps heats it up.

With the crazy over sized light, I had a huge problem with heat untill i set this up. I'm keeping the temp at 26-28C with the door open, and 29-33C with it closed(4x2.5x8 foot room lol[gettin a 400 watt in T-minus 16 hours]).

I hope this helps!

You need to vent that heat or plants would not grow. First, get a strong 6" inline fan (I have a Homebox S tent and a 400 watt MH/HPS and I vent w/424 CFM), and mount it near the top of your box. Then attach flexible ducting to your air-cooled hood, pulling air through. Then attach more ducting to your inline fan and vent out the top of your box. If you have safe access to a window I would duct it out like that (I live in a apartment and I grow in a large closet so I vent into my closet attic and works great!). I had temps in mid-90's when I ran my tests, and this has brought them down to 75-79!
If you need to be stealthy, you had better get a carbon filter for your inline fan. It is amazing how much I notice the smell when I have been gone for the day! With my carbon filter I smell nothing (I am growing AK 47s which are smelly). Hope this helps! I see big plants with fat nugs in your future! protopipe1

btw, do the doors fit back on? is it a 'trafficed room'? just thinkin makin sure its light tight for dark time.

When the doors are on its completely sealed and light proof. I'm going to get another bathroom fan and put it in my bedroom window and suck air from the outside and have the going into the closet towards the light, maybe that will help my heat problem. I am on a tight budget as I have already spent close to $500 on this room so far and dont even have plants yet!!!!

I'd invest in a cooltube...

I keep my 600 watt HPS 10" away from my plants... at a nice and easy 75F...

I can get away with 6" without heat issues... and I am running a 600 watt HPS in a tent ... 36" x 20" x 60"

just my two cents...

Cheers...

Gypsy...

Cool tubes are out of my price range unfortunatly. I added anotther ventilation fan, (50cfm), but I put this in an open bedroom window and used ducting tube the position the cool outside air directly onto the light bulb! I also raised the exhaust fan so it was closer to being behind the light, and untwisted the ducting tube for better air flow. I'm tapped out financially but I can't quit now after going this far! unfortunaly my temp is still at 92, not thats a lot better than 102 but its not 75 where I want it. Not sure what to do, also someone mentioned I will probably end up with humidity problems and need a de-humidipher.??!! So what do you all think? More exhaust or more air flow? there are 3 fans circulating air (all 50cfm) and one fan (50cfm) exhausting air, and the one blowing the outside air in. I thought that was enough but apparently not. Please help!!
Posting pics for review please check them out!

is that the thermometer at the bottom? if its just sitting under the light the thermometer it self will heat up, showing a higher temp. With the air constantly changing the air shouldn't be that hot. try putting it at the top, seal-her up and leave it for a bit.

At the top like above the lights??? I figured at the bottome where the plants will be was the best place to check the temp??

I made a small cardboard box and placed the thermometer inside that and placed in front of the closet, i sealed it up and it is now at 91F.

I would try working with a bigger fan... I know cash sucks...

You could make an effective cooltube using the glass from one of those old school oil lamps.... and use one of your fans to power it... not the best optics, but it will work...

I am sorry... I know you said no cooltube, but it is the only way I see bringing the temps down, other than kick ass (expensive) exhaust fans...

I wish there was a solution that was effective and free....

if you are around all the time, you could place frozen water bottles in front of your fan... but if it's hot they melt fast and need replacing...

Best of luck..

Gypsy...

wow all this advice and still people are not pushing about a DIY COOLTUBE....... Dont say you dont have the cash for it, they are cheap to make. You are already spending more on all that "venting", a cool tube would is what you need to cool down your room. HIDs give off ALOT of heat so you need to take that heat out before it can expel in the grow room.

FINAL SOLUTION : DIY COOL TUBE. Stop wasting your time and money on those bathroom vent fans when a cooltube is all you need.

What exactly is a DIY COOL TUBE? My light hood is just a hood with no glass under the bulb, if I was to spend more money would you rec getting a cool tube, or exchanging my hood for a hood with glass and an exhaust hole I could hook a fan up too? I heard that cools it down a lot too. So is a cool tube a way to cool it down when you don't have a hood with glass? Or do ppl use both together? Or should I just spend a little more on an exhaust fan?? I have about $100 more to spend on this room before spending the money on plants to grow in the room!!! So I need to spend it wisely, a fan, a hood with glass, or a cool tube? The cool tubes I have seen at the hydro store are around $120, I figure they were more complex than just a glass tube but if you say I can make one ouf ot an old oil lamp and a fan maybe thats my best bet, thanks again everyone!

A little research can take you a long ways. To be honest, if you would have looked all this up before hand before getting started you could have prob saved more than half the money you spent. Oh well, lessons learned daily.

Check this guys thread, the last post by me explains cooltube and even shows DIY links to make them.
https://www.rollitup.org/general-marijuana-growing/122110-400-watt-metal-halide-question-2.html

But a cool tube is exactly what you think, its a glass tube with air taking out the heat. Grow stores overcharge on those like crazy. There really is no secret behind it, just what you see is whats happening.

I appreciate your advice, however the research comment could have been left out. I did do a lot of research on this, for a long time actually, but I could do research for the rest of my life and I would still be learning it as I go once I got started, otherwise I would never get started!!!! Ok so I'm gonna make my own cool tube then, since I already have ducting going towards the light only about 4 inches from the bulb with cool air blowing towards it, should work pretty well to just attach a glass tube to that with some aluminum tape maybe? I just have to figure a way to attach it to the hood. Does the glass tube need to cover the light socket as well or just the bulb?

Can I use any type of glass tube? I know they sell the oil candle type tubes at craft stores, probably only for a couple bucks!

could'nt tell if the ballast was in there or if it's remote. if it's in there turn it into a remote ballast by rewiring it out of the grow box!!!!

yeah a cool-tube is perfect here, there are a few threads on how to make DIY (Do-It-Yourself) in one of these forums on this site.

those bathroom exhaust fans don't move much air, they are pretty much a waste, in actuality i would take them out of your grow room and either get a pricey inline fan @ $100 plus, or rig any old desk fan to suit your needs. i got a 6" fan i got from wallyworld for $5.04 as the exhaust to my growbox, it moves a lot of air, i'm guessing two of these exhausting out of your growbox would definitely do the trick. i actually took the fan apart but with a little duct tape and some perseverance you will figure out how to make it work. but bottom line is you gotta move more air! actually you might wanna look at some of these 120mm computer case fans, they are compact and move a decent amount of air for their size (try Newegg.com - Computer Parts, PC Components, Laptop Computers, Digital Cameras and more! or ZipZoomFly)

really get those temps UNDER 80. over 80 the plants suffer. over 85 is unacceptable. over 90 is lethal.

remember to take your temps where the tops of your plants will be with light exposure (radiant heat) which i'm guessing if you put a thermometer 1.5ft directly under your light you'd get temps closer to 95 or 100+

Ok so here is my incredibly cheap ($10 for glass and $8 for aluminum tape) DIY Cool Tube, Hopefully it works for me, I bought hurricane glass from the craft store and sealed it to the air flow thats coming from outside so its cool air blowing through the glass, no exhaust on the other end tho its just left open. Here are a couple pics tell me your thoughts.

Forgot to upload the pics!!! Sorry my bad!!