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Thank you for explaining that so well, TeaTreeOil, I knew quite a lot of that, enough to understand the terms you used, but my understanding wasn't as complete as yours. I really feel I learned something today, thank you very much and +rep. edit: I do have a small point which is that vented...

I agree that the fan won't be able to move as much air if you have a lot of negative pressure, but if there is a passive intake which allows air to flow in freely, you will only have slight negative pressure, which we agree is ok. The best an intake fan can do is waste electricity. There is...

A real cheap solution if you just want to raise the humidity a bit is to simply get a bucket, half fill it with tapwater, then put a towel in and hang the end about 4" over the side of the bucket, and place it near your oscillating fan. That raises my rh by 10%ish throughout the day and also...

Energy saver is just a marketing name given to compact fluorescents as they give out many more lumens per watt than the incandescents used widely for household lighting. Cfls are used to good effect for indoor growing, although yours are quite poor if 25w is equivalent to 100w, the ones in...

The size of fan you need depends on the intake temperatures and the size of the room. It's wise to have a fan capable of moving the volume of the room 2-3 times a minute with hid lighting. Your room is 2x4x8 = 64, so your fan should be at least 130cfm, up to about 200cfm, but add 10% if you want...

They look fantastic, and this shows what can be achieved on a shoestring budget, keep up the good work and keep us posted. One thing I would suggest is a thermometer/hygrometer with a min/max recall to let you see what the temp and humidity has been doing while you're away. You don't want high...

I'm very sorry about that previous comment, I didn't even look at the date, just the time. I'm so used to seeing threads posted by impatient folk who wait a few minutes before haranguing the forum for not giving them attention. I feel quite foolish now. The FAQ is a fantastic resource, and if...

I'm sorry tea tree, but negative pressure doesn't make fans work harder. It makes the air slightly thinner, and so the air creates slightly less resistance on the fan blades. If the passive intake is almost the same size as the exhaust fan, then the air should have no more resistance moving from...

There is no 100w hps on that website, at least not using their search function. There is a 100mh, but the hps come in 70w and 150w flavours.

If you create negative pressure the fan is not working harder, the air it is moving is slightly thinner and so creates less resistance on the fan blades. If the fan were blowing into a higher pressure, that would work the fan harder. The passive intake only needs to be slightly smaller than the...

Which would be a light the same colour as the plant. If the light is being reflected by the plant then it is not being absorbed, that is how we see colours.

If you want the biggest yield over time go for Sea Of Green, don't waste too much time growing them, set a mother room up if possible to have clones ready to go in every two weeks, lollipop the plants and you should be able to fit 12-16 plants in there. For more info on SOG, see Al B. Fuct's...

No an ac is simply a heat exchanger, it cools the air by taking the heat from it and blowing the cold air out one way, and the hot air another way, so yes it needs an exhaust, or it will just sit there wasting electricity.

I have heard that biocanna nutes can be a bit heavy, and should only be mixed at half the stated dose, so 1ml/litre of the vega and 2ml/l of the flores. As with any nutrients, you should never start with the full dose, give 1/4 strength until the plants get used to it, then build it up gradually...

Humidity is pretty important, it should be around 50-60% until the last 2-3 weeks of flowering, when it should be dropped to 20-30% if possible, to increase resin production. Try to get a thermo/hygrometer with a max/min recall feature, they only cost a few quid and if you don't know how high or...

I wouldn't assume that the cracks will be enough, depends on how well your house is built really. The problem with that is you have no control over where the air comes from. The air leaking in would be going through the walls, warming up slightly as it goes, making it less efficient than having...

I'm across the pond from you, in England. No medi laws over here, I'm afraid, so only me and a couple of other people who grow that I have known long enough to truly trust know about it. The idea about uvb may have to wait until I get consistent results from my setup, and once I figure out which...

So ideally you would want a bulb that gives off the same colour as the plants, right?

The only other option really is to cut a hole in the ceiling and vent to the attic, unless there are people living above you. Plants need fresh air and the co2 it brings, you can't get fresh air into the room unless you get rid of the stale air. If you exhaust the hot, stale air from the top of...

I'm certain I am right, a watt is a watt is a watt. If it goes in, it must come out, we have established that cfls produce less lumens per watt than hps, so where do you think all that energy goes? That's the thing with all electrical appliances, they are not 100% efficient, and any wasted...