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Yeah, sure, any of those would work, but you'll still need cables (those fittings only come with 12" of 600v cable), a bulb, and a reflector. Is there any reason why you don't want to just buy a kit, like this...

How the fuxx did you delete my post?

Strictly speaking, the ballast will run slightly more efficiently at a higher voltage, as less current is passing through it. This makes it run slightly cooler and consumes slightly less electricity, although you are talking about pennies per week, it's by no means a reason to switch from 120 to...

Yeah, you're right, I only read the first 40 or so posts and thought I'd about got the gist of it, guess not. So does this mean that there's no point in me topping any of my clones taken from mature mothers? I'd be kinda disappointed if that were the case, but I'll continue my experimentation...

https://www.rollitup.org/view.php?pg=faq&cmd=article&id=54

Bulbs are running at about 90% of their initial, brand new lumen output after 6 months, down to about 80% after a year. Most growers say change once a year, some say after 6 months if you want maximum efficiency, but it's really up to you. 12 months seems to be about the standard time to change...

I take clones from mature plants, so the nodes are alternating from the soil up. A couple of weeks ago I selected a pair that were as like as two peas, and cut one above the fourth node, leaving just four short branches. The other I have left to it's own devices, as a control. They had a...

Depends how good your ventilation is. A 600 provides optimal lighting for a 3x3 area, so long as you can keep it cool. A 400 will run slightly cooler, but only gives about 50,000 lumens as opposed to 90,000 from a good 600. If you have a fan that can comfortably move the volume of air 3 times a...

I'd say by the second week they should have their first if not second true node, but I only grew from seed once, over a year ago. Since then I just take cuttings and trade them occasionally with a couple of other growers I know. You have the seedlings under a 400w hps? That's a bit ott really...

http://en.wikipedia.org/wiki/Phenotype

Hey if they're growing alright I won't knock you, but if you start getting any nutrient deficiencies, you'll need to know the pH in order to accurately diagnose the problem and figure out a solution. Giving more nutes if they get locked out through pH being too high will only aggravate the problem.

It's a term for a carbon filter attached to a fan, it 'scrubs' the air clean. The term usually applies to a separate unit that just sits in the room, but it is also used interchangeably for a carbon filter attached to exhaust ducting, I assumed that was what the op was referring to.

Yeah the important thing is to get the hang of catering for the plants needs, getting a grow or two down before you start playing with them. There's no harm in setting one or two plants aside to play with and just letting the others do their thing.

That's about the smallest height you could get away with, if that's as tall as you can make it then you probably shouldn't bother with a veg period, just flower from seed or clone and they will fill the space, assuming they get plenty of light. Ideally you'll want 7-10,000 lumens per sq ft of...

Yeah the 'stat is just there so my fan isn't running all day if the intake temp gets low, which it does quite often around here. We can have 80 degree heat all one day, then it'll get down to the 60s for the next, so I wanted something to keep the temps more or less constant. I also have a...

Have the scrubber at the top, leading into the exhaust fan before leaving the grow room. This will remove all the hot air from the room and de-scent it on the way.

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There's a simpler formula here https://www.rollitup.org/grow-room-design-setup/217025-my-new-grow-room.html#post2801285 that is less controversial.

Fantastic thread for you here https://www.rollitup.org/general-marijuana-growing/723-things-know-about-lighting.html

They would revert to veg or grow balls, depending on how much light, when the light is leaking and how far into flower they are. Whether the plant/s are under any other forms of stress will also play a part. You should be looking out for male flowers, I'll assume you know what they look like. I...