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Based on your questions it sounds like you may need: 1) Cooling 2) Fresh air (replenish CO2) 3) Odor management Depending on your setup you can have separate systems or manage it with one. I use a cooltube with a DIY bat wing reflector in a small cabinet so I keep that system isolated. I use...

I used a 400W MH for veg and switched to the HPS for flower, if you can only pick one I'd choose the HPS as it's adequate for veg but better for flowering (see graph). How big your light is depends on a few other things also: how many plants you have (the area you need to cover) and your grow...

It wouldn't hurt...

Depends a lot on your setup, tent, cabinet, closet, etc. I prefer to keep my light cooling separate from room ventilation for a little redundancy and flexibility. If one fan goes out it's not the end of the world, allows me to shut off the room ventilation w/o shutting off the cooltube fan while...

I've smoked some bud that's been "flavored" with additives and did not like it, harsh and left a weird lingering taste in the back of the throat - yuck!

Awesome! That beats hell out of letting the fan blades whack you in the head trying to get close enough w/ a magnifying glass! My next toy for certain! Thanks and +rep

No problem! I'm using a SWC (shallow water culture) ScrOG, allow at least 3 gallon capacity for each plant. I use a really big piston-style air pump connected to air stones (whatever variety you like) to really boil the hydro solution. More air = better roots, they would start to rot quickly w/o...

The utility room houses the air pump, timers, and ballast. The ducting is setup as follows: the cooltube (light) is ducted separate from anything else, it's closed off from the grow box. Fresh air comes in through the mom room via a small intake fan, into the flower room then out. There is also...

Sure, take a look at my journal. The first post has a couple of drawings to get you started, let me know if you have questions.

There are a couple of really good ScrOG guides here and if you have questions just drop a a post in there. I know it's long, the guides/tutorials stand out though.

My ScrOG cabinet is 43" total inside, 32" floor to lamp, roughly 20" from screen to lamp.

Cool! Here's one for MH Same contributor (not mine) I keep saying I'm going to write down where I find these things but... what was I talking about?

There is no substitute for good genetics, the best grow environment in the world will not make a "super plant" from crappy seeds. imho Besides lighting, supplemental CO2 is the most effective thing you can do to increase yield, how you go about it (or if you can) depends on your environment. I...

Usually your exhaust fan will be a bit larger than that due to ducting loss, light trap and any filter you install (like a carbon filter for odor control). It would probably work just fine for an intake fan. I try to keep the air pressure slightly negative in my cabinet to minimize smell & light...

Just got back to see your pics, that is some ridiculously dense foliage! Great looking plants! How tall are they at this point? imho I'd start LST immediately else you'll have a lot of fun trying to train them to the screen. When I flipped to 12/12 mine grew an inch or two/day for almost two...

50cm (19.7") is a bit too far for a 250W... Here's a table I found someplace (not mine, credit to original poster) that may help. Keep in mind it does not take into account your reflector "footprint" (the coverage area) or any heat generated by the lamp. Hope it helps!

Likely but with shipping it would be probably be about the same. It was just an experiment, proof of concept if you will but it works okay. I posted it here as the concept is similar but doesn't require the ice. Actually I have a secret agenda to spur innovation....

@ Spanishfly - no question or hesitation I would take busted over snitching. Not tricky at all, jail is better than dead.

Yeah it's kinda long, just post a question in the thread, he's in & out... traveling I think he said.

Box look nice! Should be fine, I have roughly the same amount of room under a 400W HPS about 4 weeks into flower. I was very worried during the initial stretch but they calmed down after a couple of weeks. Pics on my journal, good luck!