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Thread: Light height for a 400? photos included - advice?

  1. #1
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    Lightbulb Light height for a 400? photos included - advice?

    hey all - running a 400watt HPS on electronic ballast and about 8 inches (maybe not even) above my plant tops - have them flowering for 8-9 days now and wondering safe height to keep them over the plants? Don't want to burn but want them to penetrate down far enough..

    LST'd all the plants this week to try to get bushes instead of pine trees

    Anyone offer some advice on height?


  2. #2
    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    what kind of reflector you using
    if using wing 18" is aveage .
    I go 15 with fan blowing directly at light.
    Put your hand on canapy directly under light, if it gets hot in 30 seconds the light is too close
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    Re: light height for a 400? photos included - advice?

    wow - i think i have the light way too close - maybe im burning them :(

  4. #4
    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    How long they been that close
    what is room temp
    I
    The heat in my house went out < temps got down to36f)I was able to have light at 7"
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

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    Re: light height for a 400? photos included - advice?

    their entire lives - i've had the lights really close - all through veg and now in flower for 9 days or so :( never noticed any burning - but some curling all the time - could that have been from heat?

  6. #6
    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    Now that I look closer the umbrella loking leaves is the plant saying to hot
    what kind of reflector you got on light?
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

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    Re: light height for a 400? photos included - advice?

    its just a wing - well hopefully they will thrive with a cool down

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    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    I usually just leave at 18" it is much easy er to just pull out a measuring tape then to wast a day recovering burn.
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

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    Re: light height for a 400? photos included - advice?

    i vegged them like that for about 75 days ( from seed) and theyve been in 12/12 now for about 9-10 days and seem to like the light reduction - so i am sure i always had it too low - damn!

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    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    You veged for 75 days?
    you do realize you is gonna run out of space fast.
    those ladies could go as far as triple in size
    gonna be fun
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

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    Question Re: light height for a 400? photos included - advice?

    Quote Originally Posted by Lurch Farmer View Post
    You veged for 75 days?
    you do realize you is gonna run out of space fast.
    those ladies could go as far as triple in size
    gonna be fun
    This is my first run :( I had no idea what size to veg them to so I just concentrated on keeping them healthy. They were 2 feet when i put them into flower - they've grown a few inches since and I'm tying them down as you can see. I hope that they won't get crazy - i have a total room height of just over 7 feet - so hopefully if I keep them tied I'll be ok - but I know my 400 watt light is not likely to push light down that far - just going to hope for a decent finish at this point - and some living clones by the end of the week.

    Any idea what kind of dry weight I could expect for yield on 5 plants of this size? Love to have an expectation of what i am going to end up with - anyone have thoughts?

  12. #12
    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    turn the light so parallel to sides.
    get a piece of fencing, some thing sturdy, make u shape over plants
    place pots as close as possable in center.gently force the the tops to even canopy
    you is in for over crowding probs (bugs)
    if you could remove 1 plant it would free up some space, throw in closet with 4-6 25w cfls veg till the others are done then flower for almost the same yield
    Just my 2 cents
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

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    Re: light height for a 400? photos included - advice?

    Quote Originally Posted by Lurch Farmer View Post
    turn the light so parallel to sides.
    get a piece of fencing, some thing sturdy, make u shape over plants
    place pots as close as possable in center.gently force the the tops to even canopy
    you is in for over crowding probs (bugs)
    if you could remove 1 plant it would free up some space, throw in closet with 4-6 25w cfls veg till the others are done then flower for almost the same yield
    Just my 2 cents
    This all sounds like a great idea - i need a little more help though :

    When you say turn the light paralellel to sides - you lost me :( it currently hanging over the plants and i am trying to LST the canopy to be at the same (roughly) height - would you suggest putting the fencing structure right on the canopy and then puling all new growth into it? (ie : flattening anything new that grows into the fence and keeping the lights at the same height above?

    I have a baby closet on the side that I have my clones in right now - i think these girls are too big to put in there now :( even one would be a little too big - damn.

    BUGS?!! why am I going to get bugs? where are they going to come from? the room is pretty clean, and i keep it clean every day - i had one spider in there once - he must have come in through the passive intake - but never had any other issue yet in 80(ish) days... my humidity is about 30-35% tops - what problems should i be looking for from overcrowding?

    here is a shot of the room and baby closet : (note this is before I LST'd the plants last week)

  14. #14
    420 Member Lurch Farmer's Avatar
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    Re: light height for a 400? photos included - advice?

    thats abetter perspectiveof you space
    the over crowding will not let any air under the plants
    no wind no movement, perfect for mites, and thripes ,
    and just a suggestion,you might want to flip your table over so the slats are on the top of cross support, will you be removing the table to add vert space?
    turn the light 45 degrees so it points out, this will take advantage of the reflective sides of closet. better reflction = more light to area
    You is gonna have a lot of fun.
    Lurch's 800w perpetual scrog startup
    http://www.420magazine.com/forums/jo...ml#post1967372 present
    Lurch Farms #3, 4 Hso sour diesel #11, 2 Grape ape clones, and 1 bagseed
    http://www.420magazine.com/forums/jo...ml#post1763336 Finished
    Lurch Farms 2 sour-d#11 , another 60 day veg
    http://www.420magazine.com/forums/jo...ml#post1822118 Finished

    thank you for stopping[/URL]

  15. #15
    420 Member Fuzzy Duck's Avatar
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    Re: light height for a 400? photos included - advice?

    I keep my own 400w hps between 12 & 18 inch from plant growing tips on average.


    With an air cooled hood/reflector ya more likely be able to get away with 6 to 10 inch from plant growing tips.
    We are a culture fully immersed in the ideology that truth is what we see and what we hear. Yet we hire lawyers to manipulate truth, we hire PR and marketing firms to create truth, and we hire investigators and private detectives to uncover truth. The problem to which I am affected every day is truth in the cannabis industry.

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