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Thread: Light bleaching

  1. #1
    Steelwool is offline Registered+
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    Light bleaching

    So I vegged my girls under CFLs for four weeks and stuck them under a 600W HPS. Right off the bat the large fan leaves showed signs of bleaching. I raised the light to about 4 feet away and temps are mid to upper 70s but it still seems to be going on with the larger fan leaves. Should I even worry about it? The newer leaves seem fine but it's starting to effect most all the larger fan leaves. Will it cause my plants to grow smaller/slower? What should I do?

  2. #2
    Felixthecat is offline Registered+
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    The Complete guide to Sick Plants,pH, and Pest troubles! - International Cannagraphic Magazine Forums

    check this shit out light bleach is on the bottom page just scroll down

    they say only way to fix it is to move light away
    Last edited by Felixthecat; Dec-22-2009 at 10:29.

  3. #3
    Dutch Pimp's Avatar
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    They might not have been ready for that much strong light all at once? Try and keep a cool air flow between the light and the top of the plants.
    Attached Thumbnails Attached Thumbnails Light bleaching-3788246258hpsgraphpar.jpg  

  4. #4
    Steelwool is offline Registered+
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    Thanks for the graph! Great info. Something I have always wondered about. I'll probably raise the light a bit more and get them use to it. It was just so sudden it freaked me out. Thanks!

  5. #5
    Dutch Pimp's Avatar
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    It was just so sudden it freaked me out. Thanks!
    yeah...it probably freaked them out, too....

    It's funny, you posted about this subject...I just light bleached the fuck out of two white widows.... ...using a 400 watt CMH bulb. Nothing to be done about it now...except move them, further from the light. This was a slow progression bleaching; that I didn't realize what it was...

    Will post pics...when I have time.

  6. #6
    jamessr is offline Banned
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    I read something about the bleaching is caused by the mercury leaking out of the bulb. Could this be a fact or not?

  7. #7
    EvilCartman's Avatar
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    Quote Originally Posted by jamessr View Post
    I read something about the bleaching is caused by the mercury leaking out of the bulb. Could this be a fact or not?
    Not.

    You can induce light-bleaching with an air-cooled hood enclosing the bulb. (if you really want to)
    I can picture in my mind a world without war, a world without hate. And I can picture us attacking that world, because they'd never expect it
    - Jack Handey

  8. #8
    Dutch Pimp's Avatar
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    Quote Originally Posted by jamessr View Post
    I read something about the bleaching is caused by the mercury leaking out of the bulb. Could this be a fact or not?
    don't look past the obvious...the light was too close...

  9. #9
    Dutch Pimp's Avatar
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    Exclamation Dutch Dumbass-bleaches his plants!

    Not the best pics in the world...but, a good example of light bleaching. Two WW plants 3 weeks into 12/12. It was a slow progressive thing; That I thought was a nute problem...WRONG! The one the left; started during week #2, but I didn't recognize the problem. It has always been a runt, with a poor root system, compared to her bigger sister. Then big sister started showing the same symptoms, a week later..........I screwed the pooch on these......the buds still seem to be growing OK...so far...we'll see what happens next?
    Attached Thumbnails Attached Thumbnails Light bleaching-week-3-light-bleaching-002.jpg   Light bleaching-week-3-light-bleaching-003.jpg   Light bleaching-week-3-light-bleaching-001.jpg  

    Last edited by Dutch Pimp; Dec-23-2009 at 21:17.

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