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Light Shock?

Discussion in 'Advanced Marijuana Cultivation' started by Weedymcweedweed, Jul 9, 2008.


    Weedymcweedweed Active Member

    Hey all,
    Had a question about plants and "light shock," if there is such a thing. In an ideal setup, primarily blue spectrum light is used for vegetative growth, while red is clearly superior for flowering.
    What I want to know is if anyone has proven that changing light spectrum too fast causes shock to a plant - you know, going one day to 18/6 metal halide to a 12/12 HPS. This is actually 2 questions:
    1. Does fast blue to red spectrum changes cause noticeable stress?
    2. Does changing from 18/6 to 12/12 cause significant stress?

    I have thought about supplementing some red CFLS during the last week of veg, and supplementing my first week of flowering with excess blue light.

    Also, I've thought about gradually changing from 18/6 to 12/12 via -1/+1 hour a day for 6 days.

    Would either of these "solutions" be better for my plants, or just useless time wasters?

    thanks in advance

    smokertoker Well-Known Member

    no, no light shock... Go ahead and play with adding light. There would be no benefit of gradually going to 18/6 to 12/12. If anything I would say to put a day of darkness between them.

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