I've noticed that the plants I have vegging under the hps seem crisper and to have sharper leaves whereas the ones I have beneath the metal-halide have rounder leaves. The ones under the blue also seem greener, but i'm almost sure that this is to do with the lights being on. I mean blue would show green off a little better than red.

Yet, there is definite difference between plants vegging under red and plants vegging under blue.

I wonder if there's going to be much difference in smoke quality, yield etc.
Originally we were going to switch bulbs as we have two blue lights and one red, alternate them every night cycle. But we've decided to keep them as is.

I might even market the product as jtr red and jtr blue. Can't wait to smoke the hash off this plant, anyone please give me some tips? If you can please answer in my resin thread.

Yeah you can see the difference in the texture of the plant. I have done the same thing. I really couldnt tell if either side was any better.

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metal halide always makes plants look more natural because they are closer in spectrum to te sun. HPS however, has more lumens per watt

We've just started flowering and have decided to switch the red light to the middle. In the knowledge that the plants in the middle will now produce the best quality smoke. I wonder what is going to happen to the ones we started vegging under the red as they will now be flowering beneath the blue?

Another good thing is that over the next few days we'll be pulling out the males, giving the females a whole extra third (thinking positively) of space and likewise light. I'll add some pictures to my gallery, maybe delete all but the nicest of my last ones, a week into flowering.

Using MH light (warm, blue) versus Sodium light (cool, red) may make a small difference in flowering, but not to potency. Potency is genetic. The only difference may be in yield, due to Sodium causing more stretching during veg, but that will be small.

Sodium gives most lumens per watt.

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do i have to use mh hps for flowering anybody

no, mh is actually bad for flowering. you want to flower with a hps, and veg with a mh. or you can use a hps for the whole thing if you can only have one or the other

ok soo.. what happened with the experiment. Did the mixed spectrum produce better results?? I think I remember sumasshol mentioning it might be better, a year or so later, hmmmm.......VV

That was my first grow... even then I think I was fascinated with this amazing plant. I still want to know everything.

To answer your question, yes. And all the bud I grew on that op' was top notch.

[quote=potroast;5612]Using MH light (warm, blue) versus Sodium light (cool, red) may make a small difference in flowering, but not to potency. Potency is genetic.
quote]</p>

When you say potency is genetic, this doesn't mean that we know the actual potency adaptability of a plant. Genes can adapt and evolve to match a given environment. Why couldn't a plant adapt to become more potent?
Saying that potency is genetic can be a very broad term.