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Well you said you were using a carbon filter, yes? Most likely to get rid of the smell, yes? Then it would not be a good idea to use the central AC vented to your tent unless it was blowing 24/7. The reason for this is because when the ac shuts off and is no longer blowing into the tent, the...

I have personally not used these ratchet yoyo's. Have you thought about using a hydraulic kind of like a jack or a scissor lift to put on the bottom of the trays. You could even use an electric motor with a switch to control it. I'm not sure if you are interested in that much work, but it would...

Well for some reason that pic on the home depot website is not displaying for me. Tried two different browsers. Anywho, the poly is great and you can find it cheap on ebay or at your local hydro store. I would definitely recommend getting some fans for ventilation. I found a great deal online...

Well gorge cervantes said in his grow dvd's that the 600w bulbs get more lumens per watt than any other bulbs. so the two 600 watters would give you more lumens. Of course you will want to go with the dimmable ballasts. I would recommend putting the lights on a closed ventilation system separate...

Well in that case, you would apply the same principal. choose your filter based on the size of your room and the amount of lights you have. based on the cubic feet of your space you should probably use anywher from a 400 to a 500 cfm filter and fan combo. And again if this is a closed system...

You should have positive pressure on your lights, not negative pressure. So you should blow them instead of suck through them. You should have an intake filter to help reduce contaminents in the air. The cleaner your room is the less problems you will have with bugs, mildew, and stuff. If you...

900 square feet? wow thats big. You will need a very large filter to cover that much area. You should pick your filter based on the size of the room then pick the fan based on the cfm rating of the filter. Based on that much square footage I believe you are going to need one of those monstrously...

Great Idea, I was thinking of using some of these type of cabinets as well. As you know though they cost a pretty penny and I couldn't see spending that much on some cabinets. I recently picked up a side by side fridge for free and am working on getting it converted. It is definitely a pain in...

Heat is always an issue with HID's so I would recommend getting the cool tube reflector. You can get some flexi duct and hook up one of the supplied fans to cool only the light. So the light cooling would be on it's own closed system, meaning air from outside sucked in and blown through the cool...

Don't get me wrong your plants look nice and healthy and are growing well but Iwould recommend the HPS over the Cfl's so that your plants don't stretch as much and your buds will grow larger and faster. Like BEECH said you should get a 600w dimmable that you could use for MH and HPS. The 600w...

They are actually made of mylar. I bought a pack of 4 for about 5 bucks with free shipping on ebay and used them instead of spending $25 on mylar.

Wow. Great work. I have been thinking/dreaming this up in my head lately and it is good to see an entire community of fellow nerds (no offense) working on this. I don't really have too much experience with arduino's but I learn very fast. As far as coding I'm definitely a newbie but I am going...

Well it all depends on the strain of how big they will get during flowering but it usually doubles in size.

I do have an idea, but im not too sure how easy it would be to construct. Instead of buying a very expensive tent, you can buy one of those portable closets. Which essentially is the same design just without the mylar and is not completely lightproof. If you were to purchase one of these and if...

Well I am by no means an expert but yellowing leaves usually means a nitrogen deficiency. If this is the case you will want to use a nutrient solution with a high N rating. I did see that you are using the correct Ph level in your watering so it shouldn't be a nutrient lock out. Although, having...

If you will not be using the entire closet and will not have a perpetual harvest (two seperate rooms) you will definitely want to close off some of that space. It would waste light and affect the growth of your plants to have a really large room with only one light and all of that extra space...

The trichomes will go from clear to cloudy, to cloudy and bent over, to amber, to dead. If you are growing for a dispensary you will want it to be a more medicinal high so you will want more amber trichomes, about 50/50 should be good. I would ensure that you have started your nutrient flush...

You are going to want to ensure that the closet is completely light proof and completely airtight. If you are doing two separate rooms (veg,flower) then you need to make sure that no light from either room goes into the other. You can build a simple light filter if you are sharing ventilation...