Light or nute burn? help please! PICTURES

Discussion in 'Marijuana Plant Problems' started by CHT, Feb 5, 2010.

  1.  
    CHT

    CHT Member

    My 400w hps light is 18 inches above my 2 super silver haze plants that are 5 weeks old. They are veggin under the hps and they stand about 11 inches high. I looked at my leaves and they show small brown spots that i think are related to light burn but i dont know! The spots are mostly on the tips and on the top few leaves.

    Attached Files:

  2.  
    Coolvibes

    Coolvibes Active Member

    looks like splash of feeding lights dryed it out i get it all the time no room for watering can
  3.  
    Ryando

    Ryando Well-Known Member

    Over fertilised.

    Knock back your nutes & flush if problem becomes worse.
  4.  
    CHT

    CHT Member

    right on guys
  5.  
    CHT

    CHT Member

    Any tips on how far away my 400w HPS should be from plants? I had them at 18 inches but i couldn't figure out the problem exactly so i raised them to 20 inches just incase they were getting burned.
  6.  
    Ryando

    Ryando Well-Known Member

    Remember that as long as you can place your hand above the top of your plant underneath the light and it's not burning your hand its fine or can be moved closer.
  7.  
    CHT

    CHT Member

    anyone else?
  8.  
    stonerbeans

    stonerbeans Member

    what i have is a electronic thermometer and hydrometer. It has a probe on a cable that i have hanging from the top of my box. I always hang the probe right at the top of my plants and keep it at about 80
  9.  
    golddog

    golddog Well-Known Member

    Without a hood, I hung a fishing weight on a 12 inch string to estimate height from the plants and would still bring it closer.

    With the air cooled hood, I can bring 6 inches or closer, I don't worry to much.

    That's with a good oscillating fan blowing at the tops of the plants.

    Peace - :joint::peace:
  10.  
    CHT

    CHT Member

    cool shit right on guys
  11.  
    CHT

    CHT Member

    anymore help please
  12.  
    growman09

    growman09 Active Member

    i keep mine 16-18 inches with a fan blowin across the tops of the plants
  13.  
    bran1981

    bran1981 Active Member

    x2. Been doing it this way for years and have never burned a plant.

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