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We talk about how much can be gained from going from 400 to 600w but I see little talk about the differences between bulbs. If the price range is any indicator, it is a huge variable. Surely someone has done a scientific look at various bulbs on the market in various hps wattages? Or does...

Sure. But if this grow goes well, you are going to be saying to yourself, "I just harvested XXX dollars worth. And for an investment of under $500, I can double that!"

According to my calculations, it is between 6.1% and 8.3%. ;-)

There is absolutely a point at which more light accomplishes nothing. Where exactly that point is is hard to know because other factors like strain play into it. There is also what's known as a point of diminishing returns. That means if you go from 100 watts to 200 watts, you might double your...

I'd have to guess bad glass. How long have you been using that hood?

The effect of pH on nutrient uptake depends on the nutrients being used. Some are more forgiving and less sensitive than others. I use Humboldt Master A&B and I don't worry as long as pH is between 5.5 and 6.8. I haven't made an adjustment to pH in 2 years.

I've been getting Northern Lights fem seeds from Nirvana. Never had one not germinate or sprout, and never had one hermie. They ship in some little gift item like a tin of breath mints. Good prices. I'd be willing to try Sannie's. Some things I don't like about their website is that there are...

Nobody thinks the more nutes the better. Why do people believe the more light the better?

I tried T5. Great for veg, bad for flower. No penetration.

I have double Boss Hog air diffusers and I wouldn't trade them for anything.

No. It won't help much with heat because not that much will dissipate in 10 minutes. Maybe you should sell a light and buy an air conditioner.

Well, I don't fit any of those three categories that I think exist mostly in your mind. I started growing with cfls and I had some success. But I got tired of having to rearrange them every day and getting lanky plants and airy buds. I'll say unequivocally that, with the price of hps as low as...

Obviously, it has to do with much more than time. And, if you get them too dry before they go into jars the curing process won't work. Of course, if they are too wet you'll get bud rot. Your best bet is to get one of these...

I think he means 400 not 4000. Not only do you not want it at 92, you don't want it at 82. I think the hard fact is that when it is as hot outside as it must be, and you can't supply lots of AC, then you simply don't have a suitable growing environment for this plant. It's why I don't grow in...

You can't deal with a heat problem by shutting off lights. More cold air from outside or AC, and a better way to evacuate hot air from the grow area is what you need.

I do several of those. I first float them in water 12 hrs, then put them in paper towels. When they pop and have a quarter inch or so taproot, I put them in the dwc system. I use rapid rooters instead of rockwool, but same thing.

If you have enough bubble action and your water level is high enough, you will be feeding them naturally from underneath which is better than top feeding. If you must feed from above, try to get the water (I use a syringe) down below stem level where gravity carries the water down and to the...

I'm thinking of trying these, not because I don't want to pay for others, but because of their rectangular shape. It seems to me I can configure four of them under a light better than 4 round 5 gal buckets. I think these pails are at least 4 gal, but maybe less than 5. Check them out at the...

With 4 5gal buckets, even if they are tight together, I think that's enough grow space you could benefit from a 600. Just remember your increase in yield might not be the 50% you are increasing wattage by. Let me ask this, how tall and how bushy have your mature plants been?

How many 5 gal buckets are under the 400w at a time? The growers who get the most per watt are those who are using enough watts, but not surpassing the point of diminishing returns. The only thing more light solves is a lack of light. But if you are trying to light a larger area than the 400...