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It's definitely what I'd consider "overkill" but there's no such thing as "too much fresh air" in a ventilated grow space. As far as noise; fan speed controls significantly reduce fan noise. As mentioned above; a decent duct muffler can, too. Take the proper steps to isolate the fan vibration...

Hey, AN... I'm a bit confuzzled about using the Pi as a controller. I was considering the Pi, too, when I first heard of it (and you have to love that price) but I got stuck on the "how am I going to make this thing talk to the sensors and switch on the lights?" aspect (as it's only "unused"...

10 pack? Gotta be a British thing... Even though I don't use CFL I totally want to see a pic of this.

What "tomahawk" said. The specifics depend on how your rooms are set up (specifically the ducting/timing).

I forgot to mention that you'll want to get the exhaust air from the tent as far away from the intake as possible (preferably out of the structure). Otherwise, you'll just be recirculating the same air back into the tent when it's picked up by the passive intake. Unless you're providing the CO2...

I'd like to see the white papers on those "selectable" ballasts. If they manage >96% efficiency at the lower wattage settings, as they claim their dimmable ballasts do at full output, then I'd be interested to try one. Maybe after the "new toy" prices come down to a more reasonable level. It...

Not to mention the blown-in insulation; the dust that stuff makes when disturbed (and if you're carrying water upstairs every day, you'll be doing a lot of "disturbing") will pose a problem. And it will conceal mold/fungus spores and (if the house was insulated before 1979) it might even contain...

I'm still here and I'd enjoy seeing what you're working on...

T5's lumens/watt efficiacy is as good or better than most MH lamps (see the Wikipedia article on "luminous efficacy" for basic information). Regular T12/T8 bulbs are nearly as efficacious and far less expensive, so I'd use those. Straight 4' fluorescent tubes produce more light from...

I think of a "grow" as running year 'round, too, "Budley". So you're definitely not the only one. I wouldn't ever personally recommend an attic grow (at least not in what I think of as an attic) because the temperature/humidity fluctuations throughout the year (even during the same day) are so...

Yes, I can write English proficiently. Does that intimidate you? Even so, it's no reason to make a baseless assumption then follow up with a poorly-written excuse for a trite insult against an entire set of vocations/professionals. What an odd sort of bigotry (I don't think I need to explain...

Really? You want to go there? You didn't specify how much you pay for electricity. Without that VARIABLE, there is no way to calculate how much it will cost YOU. Also, you didn't specify how long you veg for. There's another VARIABLE that you left out. Did you even wonder why nobody had answered...

To calculate how much electricity a given lamp will use and how much it will cost you, get out your last electric bill, a piece of scrap paper, and your trusty calculator and follow these simple instructions: 1: Find the total amount you were charged for electricity ($) and divide it by the...

It took me a while to get this finished; looks like "Trulife69" already addressed this but I'll add my comments anyway: I presume that you mean dolomite lime (as opposed to hydrated lime). I wouldn't bother trying to dissolve it. In fact, it's probably easier to distribute it evenly if you...

Here's a link with the basics of pH in soil and solutions for raising/lowering pH: http://www.cannabis-spain.com/ph-soil.htm If you're comfortable with safely handling lab reagents, you can use nitric acid (NHO3; pH down) and potassium carbonate (K2CO3; pH up). Some important things to...

I've been looking everywhere I can think of and can't manage to find containers like the ones you're using here to hold the net pots. May I ask where you found them?

"ViaGrow" (through hydrowholesale, among others) sells a 6" tube with 31"x24" reflector bolted on. It's basically the footprint of a Magnum with the cooling efficiency of a tube. Plus it's just 7" high overall (very little headroom required compared to a "conventional" air-cooled hood). You have...

To reiterate: the "positive pressure" thing is dead wrong. Negative pressure is necessary to ensure odor elimination (filter and fan should be equally matched in CFM rating and a speed control should be used for such a small space). Positive pressure would cause odors to leak out any...

I'm guessing you didn't even bother to read the entire post (which said basically the same things everyone since has said; except that I expressed concern for your budget and the actual end result being able to provide high-quality medication). You post a barely-legible "diagram" and few other...

I should add that the diagram is nowhere near right as far as scale goes. You'll need to do some math there; the space between the panels and the frame (or the size of the holes in the panels if you choose that route) should be equal (in square inches) to the size of the intake or exhaust. This...