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how can you compare 1000w HPS to 100w CFL?

this guide helped me a lot http://thegreenpagesgrowguide.com/

Well for one you should have an exhaust even when using cfls or t5s. Your plants need constant renewal of the air in the room. I find cfls and t5s are fine for vegging though.

Usually means 13 weeks of flowering. So 13 weeks from when the plant begins to flower, which normally begins a little after switching to 12/12, not immediately.

I generally go with 1 gallon per vertical foot. So, I'd make sure a 3ft plant has 3 gallons of soil.

Clones under 1000 watt hps isn't good! A couple of watts of cfl does fine for babies.

I'd say over-watered. Wait until the soil is completely or the plant starts to wilt before watering. Make sure there are enough drainage holes at the bottom too. Perlite or sand in your soil mix can help with drainage problems.

If you have no alternative a CFL will do for flowering. Just make sure you have enough light. Some info on lights and CFLs: Grow Lighting

hi, i top after 4 or 5 nodes and it usually works out well. i recently topped a skunk plant after 5 nodes and it's developing nicely. here's some training info if ur interested.

That seems fine to me. You can either intake air from outside to cool your lights and vent it to the outside, or you can simply have 1 exhaust which sucks air from the grow room, through the lights, through your filter and out. Either way wherever you exhaust air you will need an intake too (but...

It's better with the glass hood if you can put the light closer to the plants. Make sure the glass is always perfectly clean to reduce the loss of light.

Hi, 600 watt HPS setups are the most efficient, giving more lumens per watt than the others. Also, a 600 watt HPS will give you almost 6000 lumens per square foot for a 4x4 surface. This is plenty, and you won't need to go much higher unless you are enriching with CO2. Two 400 watt setups...

Some ballasts will allow you to run HPS and MH bulbs. You can use dual spectrum bulbs in these also. You can buy a HPS ballast and use the dual spectrum bulb in it, and you won't need a MH. So you just need to decide whether you want to be able to choose between MH, HPS and dual spec, or simply...

I think you would be better off with the 1.2x1.2 space. A 600 watt is easily enough light for that, and unless you're injecting CO2 you will be wasting light with a 1x1 space. Here's a guide to lighting that explains everything you need to know.

I use 6500k for veg but I think the 5000k will do. Here's loads of info on grow lighting.

This page explains the light cycle. This page explains lighting, such as wattage, bulbs, etc.

Guide to topping

the dr90 is good. i have it a couple of years now and it's going fine. you have more than enough height. if you are only growing one plant you shouldn't need a tent that big though.

Here's some info a different lights. You need to know how big your grow room is going to be before you decide on which lights to buy.

One of them is 4000k and 41000 lumens and the other is 5000k at 30500 lumens. The 1st one gives off more light, but i think 5000k is a better spectrum of light for vegging. I'd probably go for the one at 5000k. You should be able to find MH bulbs which give off the right spectrum and have a...