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Thread: Light Distance Chart's

  1. #1

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    Exclamation Light Distance Chart's

    MH-Light Distance Chart




    HPS- Light Distance Chart


  2. #2

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    hmmm ive never seen the MH one before. i knew HPS gives greater lumen output per watt than MH but i never realised the discrepancy was so large.

    i wonder if having an extra 14,000 lumens would be more beneficial than more blue light, with a 400w HPS over a 400w MH in vegging; in terms of speed anyway.

    id really like to do an experiment

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    Quote Originally Posted by Bitterfly View Post
    i wonder if having an extra 14,000 lumens would be more beneficial than more blue light, with a 400w HPS over a 400w MH in vegging; in terms of speed anyway.
    I wouldn't of thought so. The right colour spec (MH) for vegging does seem to stimulate them for faster better vegging. With the hps you would get more stretch aswell.

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    is it actually worth using the budget option of cfl or saving some pennies for a hps or mh light instead?

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    Ok already posted this on another thread but then found this one. Thought it better placed in here. Hope they are accurate enough:



    [IMG]http://i44.tinypic.com/2a5bpee.jpg[/IMG
    'there was a young man named jobby,
    who haboured an illicit hobby,
    with renknowned growing fame,
    he put our plants to shame,
    that bright young man named jobby'

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    Quote Originally Posted by jobby2812 View Post
    Ok already posted this on another thread but then found this one. Thought it better placed in here. Hope they are accurate enough:



    [IMG]http://i44.tinypic.com/2a5bpee.jpg[/IMG
    thats a nice little chart jobby


    ps loving your sig ahhahahah

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  11. #7

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    Me yeah I love it. Oh yeah forgot this one as well.

    Last edited by jobby2812; 21-01-09 at 07:14 PM. Reason: forgot pic

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    Quote Originally Posted by matbigpen View Post
    is it actually worth using the budget option of cfl or saving some pennies for a hps or mh light instead?
    it all depends how you grow and where ,if you have heat issues then cfl if you are vegging for a short period cfl,if vegging longer i'd use mh for better penetration to lower growth,flowering hps although you can go start to finish with with mh or hps.

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    Quote Originally Posted by lkdj2003 View Post
    I wouldn't of thought so. The right colour spec (MH) for vegging does seem to stimulate them for faster better vegging. With the hps you would get more stretch aswell.
    iv never had a streched plant under a hps.... they have all ways been nice tight and compact real bushy, and fat buds in result. if u can keep it sweatyish 45-75% Rh then ur fine.
    74 for veg and 45 for flower

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    Dont suppose theres something simular for CFL's?

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    when the chart refers to the lamp being to close is this because of heat? im using a 400w cool tube hps. does this chart meen anything for me?

    cheers
    ric

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    Quote Originally Posted by Mr_Bimble View Post
    Dont suppose theres something simular for CFL's?
    With CFL's you can have them about 3" away for best results but make sure they don't get to touch your plants or they will burn.

    Quote Originally Posted by ricochet View Post
    when the chart refers to the lamp being to close is this because of heat? im using a 400w cool tube hps. does this chart meen anything for me?

    cheers
    ric
    It is for heat and also you can light poison your plants if the HPS light is to close. So yes mate you could have the light an inch or so closer than what the chart states if you are using a cooltube.

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    thanks for the reply, if only i had your experiance and knowledge!! peace!

    Ric

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  24. #14

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    No prob's mate. You will if you keep reading and asking questions and take it all in mate, but bear in mind we are all still learning thats the good thing about growing.

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    newbi question here so in reference to the light distance charts does it matter what stage of growth your at ive just started veging in a 1m x 1m 2m tent under a 400w lamp about 2 1/2 feet away is this too much?
    Even genius has to pay its dues.its's goodbye to the shortcuts,hello to the grind.nobody ever said it would be a easy ride.so push more,risk more,feel more,how much is just a question of courage,a matter of heart.

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    is this the height for both veg and flower stage and if so what height should i keep it above my seedlings if i plan to use 400w hps light

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    Quote Originally Posted by ipmiller View Post
    is this the height for both veg and flower stage and if so what height should i keep it above my seedlings if i plan to use 400w hps light
    I wouldn't use an HPS on seedlings as its too strong and you could easily fry them.
    With CFL's being nice and cool I'd be tempted to use a 200W 6400K CFL until they're at least 6" high - then switch over.

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    that seem too hot 400 watt one foot 50 away from it wouldnt that fry it ????

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    I can have my 400w hps at half a foot to a foot away from the top canopy at 26.C, would it fry my plants because the light intensity is to much or somthing like that, or should I wack the 400w hps half foot away?

    Peace
    Fear is not the natural state of mankind

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    Quote Originally Posted by Muller View Post
    I can have my 400w hps at half a foot to a foot away from the top canopy at 26.C, would it fry my plants because the light intensity is to much or somthing like that, or should I wack the 400w hps half foot away?

    Peace
    Hold your hand over the top of the plant and if it starts to feel uncomfortable on the back of your hand after a minute it's too close.

    Get your fan running between the top of the plants and light.

    I have my 600w hps 8 inch above my plants this way

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