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I read somewhere that using my plants (ave plant) only yields 12-14 grams ova a 12-16 week period!, but I also read somewhere 1 plant could yield 3 ounces????

What's the truth? I'm in the process of growing White Widow?

Do different color lights produce a different yield?

Does blue lighting encourage foliage growth?

What's better, blue or orange light? or both?

Many factors must be taken into account when trying to figure out how much your plant will yield and even then its still only a guess. When grown right they can produce more than 3 ounces per plant.

Metal halide (blue/white light) lights are best used for veg stage but can be used for both veg and flower.
High pressure sodium (HPS, yellow light) is best for flower stage but again can be used for both stages of growing.

Some people will use MH for veg then HPS for flower, some use both all through the grow, those with money constraints have to look for cheaper options such as compact flourescent lights (CFL), to get the desired colour spectrum when using CFL you go by the Kelvin rating, 3500K is known as 'Bright White' is best for veg stages, 5000K+ is known as 'Daylight' which is best for flower, most usually go for a rating of about 6000K for flower when using CFL's. Remember these will not produce the same kind of yield as the MH/HPS combo will.

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How much will I get? - Ahhh, one of the most common questions without a good answer....

Basically, read all you can about growing , do your best and see what you get . Try to record or remember your methods (soil mix, fertilizing schedule, etc) and you can learn from your mistakes.

Overall, you just have to get out there and do it and see what you get. The sooner you start, the sooner you have bud...(usually) Everyone will get a different result every time.

The whole 12-15 grams thing is for a plant in a Sea of Green I believe. If you have plants growing taller than a few feet, you can probably expect an ounce or more from each one. If you aren't getting that, you might want to get some new seeds. Oh, and read about and set up a mother plant for clones!! So much easier than seeds and males and shit!!! It takes a while but it's worth it.

Don't worry about how much you'll get, worry about the overall health of the plants and you'll be better off. That's how I would try to think about it anyway.

3 major factors play into this 1st, the strain you grow, 2nd the grow environment you provide for them. 3rd Vegg time you allow. The longer you vegg the higher the yields could be provided you choose the right strains to grow. Also your grow room needs to be dialed in to suit MJ growing conditions. Lights on you want to keep temps between 73 to 75 degrees unless using co2. You need good intake and exhaust system Good lighting system you want to shoot for 3000 lumen psf for Vegg stage and 5000 lumen psf for flower stage. RH should run 50 to 60%. But the one thing that you need to keep stable is your PH whether your growing in soil, soiless mixs,or hydro. PH is very important in nutrient up take if PH gets out of whack it will cause your plant a host of problems main one being nute lockout. But I never shoot for weight I shoot for providing the best grow conditions I can. Then let the plants do the rest. My avitar is a Papaya that is about 3 weeks into flower. That is what I get from the grow conditions I just explained to you ...take care..

As, far as I'm conserened Green Lighting has to be the best for veg, wouldn't know what flowering would be though??

Green light has nothing to do with Vegging a plant it can be used to work in your garden after your lights are off but other than that no use for your garden. Blue/white light is what you use for vegg stage IE. MH, T5s or CFLs. Red/yellow lights IE. HPS or CFLs are used for flowering stage. Or you could also use LEDs with same color ranges as stated above...take care..

Metal Halide (MH) is slightly preferred for Vegetative Growth.
High Pressure Sodium (HPS) is preferred for Flowering.
The best combination of these in terms of spectrum is probably 2 HPS and 1 MH on a light mover system.
Some more expensive bulbs have a more balanced spectrum.
You can keep those plants on 18-24 hours of light per day (I think 24 would be best) and grow them a foot or 18" tall, then give them a good dose of bloom fertilizer and put the light on a timer 12 hours on/12 hours off. If you ABSOLUTELY HAVE TO go into (PITCH BLACK) growing area: That is where you use a green light. There should not really be a reason to go in there at night. You shouldn't be watering them at "night" and it's best to just leave them alone to rest until the timer turns the light back on. Don't let any light other than green light get to them when they are supposed to be in the 12 hours of darkness or they will be stressed and probably delay flowering or turn hermaphrodite and produce seeds that are shit.

Thanks for everyone's input

Another thing about light!

When you using CFL's I'm getting a lumens reading in the thousands, but with the metal halide bulb, I'm getting a reading of 200 lumens.

Is this a good thing? Do I need light that projects a bunch of lumens?

Sounds like you have your numbers switched around, unless....the CFL's = 600watts or so, and the MH is like 100watts.

HID=High Intensity Discharge. There are lumen output charts around to tell you what each type bulb should put out in lumens. I dont have a source right now, but a lot of hydro stores will have the info online, or a bulb manufacturer, there might even be a chart here at SF, proly as a sticky. I havent looked so dont know for sure.

another thing to add though, the higher the lumens the better. thousands will produce bigger buds than hundreds, if hundreds will help produce them at all

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Seeing how I'm wrong about my lighting theory, or so thats the consenses of the majority. Then, what would be a great light for flowering black and red?

I think UV-B is the only "black" light that actually effects the growth of cannabis. Not 100% on that but it rings a bell. The red/orange spectrum is what you're after in flower though.

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