Cooltube= AWESOME!!

I built my own cooltube yesterday using a Bake-a-round, I've got a 150HPS chillin THREE INCHES over the two girls (LST'd) and the temp stays 81 at the very top of the canopy! Before I was having to keep the light 8 to 10" above the canopy and we were still struggling with temps at around 86, peaking at 88! My cab is only 3 feet high, so I am REALLY liking the max potential with this bad boy!

Do you have any pictures?

yeah lets take a look man...

Hopefull ythis works, I haven't successfully attatched pics yet! These are Lowryder#2/B.C. Mango cross. Switched to 12/12 cycle 2 and 1/2 weeks ago. First attempt at growing.

Nice work! Plants look good too!!

Why thank you! I am pumped

fuck man plants look bomb as fuck how long have you been growing them?

That is awesome! I've been looking for a cheap alternative to spending £40 on a cooltube, just went on ebay and found one for $5, although shipping to UK is $23. Worth it though, thanks for the tip!

wow. those plants are super bushy because of that light. i love it.
nice ghetto tube
+rep

Thanks ya'll. Actually I vegged under CFL's! Six, 4 daylight (6500k) and 2 yellow (2700k) They stayed nice and compact because they're Lowryder#2 genes, but they aren't autoflowering because they were straight crossed by B.C. Mango. They were about three weeks from sprout when I switched to 12/12. I had three but a male showed VERY soon and VERY testicularly. I finally got the 150w HPS from HTG supply (69 bucks!) and bought all the stuff for the cooltube later. They've been under the HPS for about a week and they like it. I guess they are about a month old at this point?

if you're looking for a cheap 150 watt hps that you just plan on throwing into a cool tube you should check out my post https://www.rollitup.org/indoor-growing/101214-very-inexpensive-grow-light-20-a.html

If anyone has experience with a cool tube, I could use it.

I'm planing on making a new grow cab, and for design purposes I need to know how much CFM I would need to use on the cool tube to be able to adequately cool a 400 watt hps. I know size depends, but I was just looking for a general idea.

I personally am I fan of S&P Mixvent Fans, located here:

Soler & Palau Commercial Centrifugal, Axial, Propeller, Exhaust and Supply Fans - Soler and Palau - HVACQuick.com

Any ideas?

nice work. where does it vent to?

Yes the cool tubes are the best.....they saved my ass with a 400watt in 115 degree weather. GEEEZ

data said:

nice work. where does it vent to?

Click to expand...

Thanks! Vents to the garage.

Whats the pop bottle for?

Where did ya get the bulb???
My 150's are rather fat in the middle.


Foot note, move the straws up higher for the yeast CO2. CO2 is heavier then air. (but then a circulation fan can move it around just fine)

I must be missing something here. In the first photo, I only see ventilation on one end of his Light. I am sure it is there, but can not see it.

good catch LDB i didnt even see that ... looks like we need another duct on that to complete the independant circuit

that cooltube is hard bra.
I can dig it
i see you got a sensor like me too.
Looks good but you do need to make ya light air tight by having another duct on the otha side