Desertboy said:

I thought it was obvious I was talking about using a 7200k MH 12/12 and the 12 hours the MH is off using 450nm LED's which will hopefully do as I quoted.

I could use the genefinder (Flick 12/12 for 3 days then back 18/6) method but where's the fun in that.

I like to fuck about you don't grow like I do and not like fucking about, that's why I immediately bought 2 lamps when I saw this thread (Well within a week) because I love it.

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primeform said:

ok i missed deserts last post. let me read up on the subject of 450nm blues.

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Desertboy said:

You have to wonder what if I light a plant with far red and 450nm blue at the same time?

Can we get a plant we can light 24/7 yet flower that's not a ruderalis strain?

I also wonder about lighting 350nm during the dark period or with FR.

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which elicited normal stem elongation in response to crowding, with nonelongated plants grown in high-density stands receiving a high ratio of red : far-red (R : FR) light that suppressed the elongation response.

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This result indicates that, as either a direct or indirect response to higher R : FR, stomatal conductance and therefore photosynthetic rate were increased. However, in the density experiment, we found no significant difference in photosynthetic rates between high-density and low-density plants. The high-density plants had higher stomatal conductance and higher specific leaf area. These results indicate that the lower specific leaf weight of low-density plants is more important than the light quality effects on stomatal conductance in determining the effects of density on gas exchange.

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Phytochrome-mediated stem elongation in response to crowding and vegetation shade is hypothesized to be a form
of adaptive phenotypic plasticity. The increased stem elongation is thought to allow the plants to place their leaves above their neighbors, increasing light interception. Light that has passed through a canopy of leaves has a reduced red to farred ratio (R : FR) (Smith 1982). Via the phytochrome family of photoreceptors, plants are able to detect this change in light quality and respond morphologically (Smith 1982). A typical shade avoidance response is characterized by dramatic stem elongation, reduced branching, and a redistribution of leaves to the top of the canopy (Smith 1982; Geber 1989; Weiner et al. 1990; Ballare´ et al. 1991; Weiner and Thomas 1992; Schmitt and Wulff 1993). Even before plants are directly shaded, light reflected off neighboring plants in a developing 1 Current address: Department of Plant Biology, 502 Life Sciences Building, Louisiana State University, Baton Rouge, Louisiana 70803, U.S.A.; e-mail smaliak@unix1.sncc.lsu.edu. 2 Author for correspondence and reprints. Manuscript received September 1998; revised manuscript received February 1999.
dense canopy is sufficiently lowered in R : FR to elicit an elongation response (Ballare´ et al. 1987, 1990); thus, important functions of phytochrome may be to sense future competition for light and to trigger morphological and physiological responses to avoid future shading (Casal and Smith 1989; Schmitt and Wulff 1993). Recent studies have demonstrated that elongated plants have higher fitness in high-density conditions and nonelongated plants have higher fitness in lowdensity conditions, as predicted by the shade avoidance hypothesis (Schmitt et al. 1995; Dudley and Schmitt 1996). But while such studies provided strong support for the shade avoidance hypothesis, they did not explicitly test hypotheses about the costs and benefits of the stem elongation response that cause the fitness differences.

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Pure Blue (400-450nm) inhibits the Pfr/Pr conversion, but not as much as the Red Spectrum. this can be used to our advantage when sexing young plants. The blue light would be used during HALF of a 24/0 veg cycle. ....that is, instead of placing cuttings under a 12/12 cycle. The whole plant is placed under 12hours of veg spectrum (6500k) then instead of lights out, they get 12 hours of 400nm blue light.

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dextr0 said:

We all know UV-b is meant to be frostier buds so why not 24/0. Because most who have tried found more than 6hrs a day to be detrimental as opposed to beneficial. So though it caused increase in trichomes for protection, after a certain point it started destroying the same thing it was helping create. The plant like humans can only take so much UV light...
....or this is the accepted theory.

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Desertboy said:

Yes but did they pulse the UV light to even 6 hours light over 24/0 with FR pulsing in the dark period, hmmm.

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Desertboy said:

Since you are obviously passionate about the issue I wonder if you have pics of your FR experiments I'm always interested in others experiences and you sound like you have first hand experience and TBH we need all the friends we can in this game. I'm a cocky cunt sometimes and blinded others but when it comes to wavelengths of light I'll take any help I can get. Especially when it comes to wiring these LED's up.

I see a lot of people talking about it and no one actually putting the money where there mouth and trying prove theory. (Except primeform) That;s why I'm building several rooms to light with several different NM to get a far better idea what's going on.

Where is the FR!

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