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The dividing by 5 is not correct. Cubic feet per minute, you multiply by 5 if you want to exchange air 5 times a minute. Like freddie said, dividing by 5 will exchange every 5min. To calc proper cfm, you must provide more details. What is your temp now? What size light? Air Cooled hood? Intake...

Im looking for a 250w reflector hood. It must be air cooled. So the question is, what is the best reflector hood for a small space? The dimensions of the hood can not exceed 1.5ft W by 3ft L. Currently the front runner is a Euro Hood. Does anybody have any experience with these...

Thats basically it. Switch to 12/12.

I use T5's for clones. Two bulbs. They seem to work well but produce more heat than I expected. I dont think I would use them for flowering.

Hey hey... Im trying to figure out ventilation for a small cab right now, so maybe we could work together. I put my post in the newbie place, ya bad move. Anyway, a room thats 10x8x8 is 640 cubic feet, assuming its a perfect triangle cut that in half so its like 320 cubic feet. Dimensions for...

They leak like crazy and normally dont come with a stand so its a pain filling up the bags. With some duct tape, the leaks can be fixed, but its still not something I would buy. Currently, I use an NO2 and happen to like it. Its still fairly new to the market and Im quite skeptical about how it...

Im changing my lights to a 250hps cause UFO led's are not cutting it anymore. I will be purchasing a Euro air cooled hood with 6 inch ducting 250 cfm duct fan. I also have two axial fans for intake totaling 230 CFM in, 115cfm a piece. The cab is 20 cubic feet. Im concerned with the temp...

Thanks again!! Ya looks like I should be good. Excited about making the switch for the Lemon Haze. Know anyone who wants some UFO's at a discount? I plan on getting an air cooled hood and ducting the heat out of the cab, we'll see how that affects the temp. The UFO's put off more heat than...

Sorry, must have misread the previous post, but ya I completely agree with you. Its a marketing scheme, and it got me. Just too good to be true. Thanks for the advice, Im going to make the switch after I pull these girls. Do you think 250w is enough for a small cab. Obviously, Im going to...

Trichs are just starting to get milky, couple amber here and there. Pistils are red, but the trichs are just not where you would want them to be. To be honest, I might just pull them this week. Im at the point where Ive run out of my budgeted amount of flower supplements, and Ive really just...

This might not be the best place to post this, but here goes. I have two plants, Dinafem Blue Hash, 8 week estimated flowering time. Im growing in bubble hydro system. They have been flowering for like 18 weeks. Way too long, something has to be up. I havent done anything to really stress the...

Its not the airstone that produces heat, but rather the pump. I dont know the exact physics, but I'll give it a go. The pump is forced to squeeze air through a smaller space than it is designed. With that in mind, the pump has to work harder. The pump heats up and the air that flows through it...

120 air stones at .20 a piece. http://www.aquacave.com/blue-air-stones-1-120pcs-pack-178.html

Does anybody have any experience with one of these bad boys? http://www.lagunakoi.com/Air-Diffusers/Single-Air-Base-w-Disc-p-574.html Do they put off any heat?

Well I hate answering my own questions, but I did a little bit of research. So from what Ive read a standard bubble disc can handle 5 - 15LPM. Of course quality plays a factor in determining what the disk can handle.

Anybody have a general estimate on how many litres per minute of air that can be pushed through different bubbling pieces? For example, Im thinking that a 5inch bubble disk could handle 10LPM, and as such warrant a 40LPM pump for 4. I really dont have a clue though.

So I called up some friends. They mainly agree that the powerhead is not a good idea. In theory it works, but in reality a powerhead puts out more heat than a standard air pump will. During summer my res is in the mid 70's, which is about as high as I ever want them to get. Thumbs down on the...

Good info gobbly, Ive never heard of using a powerhead. Very interesting. Yes, the primary purpose of the pump is to maintain a high level of gas exchange between the nutrient solution and the roots. My Res stays in the mid 70's during summer and low 70's during winter. Im not really...

I cant really help at all with the technical stuff, but I can help with the SCROG idea. While SCROG does maximize your space, it will also maximize your yield. With more space you can develop a larger screen to SCROG with. It will easily double your yield. Keep in mind there is a lot more...

I could really use some help... any help. Ive narrowed down the search even further. Now I am torn between the Dual Diaphragm Pump and an Alita AL40. From what Ive heard, Alita's are where its at. The Alita uses 46W for 48LPM, which is kind of a jump compared to the 12W one I use now. The...