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how far should my light be away from my plants?

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  • how far should my light be away from my plants?

    i soaked my seeds in distilled water for 24 hours with superthrive and have a 400 watt hps, i was wondering how far the light should be away from the plants, i will be just plopping them in the soil after the 24 hours is up, waiting for them to sprout and then placing them under the hps. i have heard 18 inches is the ideal distance, is this correct? thanks again, nugz

  • #2
    i read that u should keep an HPS a little further, because the light is so intense for the little ones. Try 30 inches for the first 2 weeks, then move it down to 18". I think when i grew mine i had my 400watt hps 24" from the plants and put a piece of window screen between the light and the plants. Good Luck.

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    • #3
      There are certain factors, specifications Say 250w should be 3-4 feet away and 400w 5-6 feet away Unless of course you have a air cooling hood for your light, I'd recomend to deffinitly buy one or make one yourself like I did.For Flowering plants You want the light as close as possible to the plants without severly burning them (yellowing the leaves) Just hold ur hand underneith the light and slowly move it closer toward the bulb, when your hand feels uncomfortable due to the heat a good rule of thumb is to give it 6-8 inches lower from that point. SInce you have babies to be on the safe side id recomend using a min of 40w or 2 24in 20w bulbs of Flourescent lights to get things started, You can put those 1 to 3 inches away with no worries. hope this helps.
      Annoyed? Is your dealer late again as usual? Been arrested or stiffed on a pickup before? GROW YOUR OWN! :D

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      • #4
        Okay, we might start a riot in here..so bear wit me.I don't suggest puting ANY seedlings straight under the HPS, without a couple of weeks under the flo's (get the ho's so low, that u can just get your hand between ur plant and the bulb.) with a fan blowing on them .Then move them under the 400..put it about 2 feet up and slowly lower it around 4 inches or so a day until about 16-18 above, depending on how hot it gets.....remember it's not the light that kills em, it's the heat. It normally dries out the soil faster than u can keep it watered and the little ones fall over and die..peace

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        • #5
          Suggestion, rather than move the lights closer to the plants... raise your plants off the floor closer to the light. Constantly moving those lights is a bitch!
          Legalize marijuana for personal cultivation and use. Alcohol causes far worse problems!

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          • #6
            looking for help....

            im a very new member so new i dont even know how to post something myself so please have patience with me...this is my first year growing....already have some tips but needs lots more....my plants are indoor for now but will be going outdoors....there around 1.5 weeks old...around 2-3 inches long.....i put them outside during the day to get sun but wasnt puting any lights on them during the nite.......I am going to purchase some lights today but Ive heard 400w hps is what I need...is this true and I dont have a certain place in my house for them yet...I do have a spare bedroom?so if anyone can help it would be great....im looking for what type of light...how far from plant and where to put them....closet or spare bedroom?thanks

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            • #7
              Newbie gal....you have much to learn. Not trying to be rude....but hijacking a thread will not get your questions answered. Id suggest reading the FAQ....because everything you just asked is in there. Also ask in the beginners lounge for a wide consensus of views. It seems chicks around these parts get preferential treatment if ya know what I mean


              As for how far to keep the light away? Simple....dont use it yet. Get some compact flouros and get the lumens right on the seedlings. Its cheaper and you wont scorch your plants.
              If you use the HPS you will battle 'stretching'. And that can be a pain in the ass. They are easy to break at that age. Then you will find yourself building ghetto little contraptions to keep them upright....which will just get in the way.
              Just my opine!!!

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              • #8
                wow

                i have heard from many before i posted this thread that grow completely from seed to harvest using an hps with alot of successs, i wonder why no one has stepped forward yet? do u guys really think putting them under flouros to begin is the best choice? i used fluoros before to start some plants and only 3/8 survived. i don't know what to do. also by the way my hps is air cooled, and i do have cold air running directly to the bulb also tempered glass is used. any advice on what do do is greatly appreciated. thanks again, NUGS

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                • #9
                  Hps

                  I'll step forward, The last seed I planted has been under 400W HPS its entire life. 20 hours a day, 4 hours dark, and the plant is growing perfectly. I guess it stretched a little bit, but it's definetly the fastest growing plant ive had. Like I was saying to someone else, I recommend trying it. This is the only plant ive ever done it to before, and I am really pleased with the results. I think the main reason people say to use floros at the beginning is just because you can get the floros so much closer. I'll throw a picture of it up later. Peace.:D
                  KRONDIKEBAR: TAKING THE GUESS WORK OUT OF GRAND MASTER GROWING!!

                  SICK PLANT?? LOOK HERE FIRST!!
                  http://www.icmag.com/ic/showthread.php?t=11688

                  MY D.I.Y. DWC SET-UP - BUBBLE BUCKETS
                  http://www.growkind.com/forum/showthread.php?t=26773

                  CURING 101 - Thanks, Stickyicky24
                  http://www.growkind.com/forum/showthread.php?t=39705

                  How we clone - Thanks Rasta R.B.
                  http://www.growkind.com/forum/showthread.php?t=41889

                  CURRENT GROW:
                  LA CONFIDENTIAL
                  OG KUSH (BUBBA?)
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                  • #10
                    I forgot to say...

                    oh yea, and since you have an air cooled HPS I would recommend trying it even more. If you can keep that thing pretty cool, then you should be able to get it fairly close to stop the stretching. just my thoughts tho, peace out.
                    KRONDIKEBAR: TAKING THE GUESS WORK OUT OF GRAND MASTER GROWING!!

                    SICK PLANT?? LOOK HERE FIRST!!
                    http://www.icmag.com/ic/showthread.php?t=11688

                    MY D.I.Y. DWC SET-UP - BUBBLE BUCKETS
                    http://www.growkind.com/forum/showthread.php?t=26773

                    CURING 101 - Thanks, Stickyicky24
                    http://www.growkind.com/forum/showthread.php?t=39705

                    How we clone - Thanks Rasta R.B.
                    http://www.growkind.com/forum/showthread.php?t=41889

                    CURRENT GROW:
                    LA CONFIDENTIAL
                    OG KUSH (BUBBA?)
                    GRAND DADDY





                    Comment


                    • #11
                      how far was that again?

                      ok, well i've been thinking and there's no way i will get all 14 of my plants under my T8 4' flourescents!

                      SO.................no matter what some plants will have to start under the HPS. and i'm pretty sure i will be putting them ALL under the hps from seed to harvest.

                      i soaked my seeds in water and superthrive for 24 hours and then planted them in some fox farms ocean forest soil mixed with some perlite on 5/31 at 8:00 pm. it's been about 16 hours and none have popped yet, but i expect them to start sprouting 2morrow around the 24 hour mark so some answers would be helpful

                      the question still remains, how far away shoudl the light be?

                      thanks again, any knowledgeable answers are appreciated!! NUGZ

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                      • #12
                        I think you've gotten some good responses...Get them as close as possible w/out burning them...Put your hand under the light, if you can keep it there indefinitely w/out burning, your probably ok...Check the plants everyday at least, or better yet, as often as possible...If I'm home, I'll check mine several times a day, just to make sure all's well....I use a 400w cmh bulb under a 4' vertizontal hood, it doesn't retain the heat as much as a smaller reflector and I'm in an open space (an unfinished basement) that stays pretty much at 65-72* I also have a small fan blowing across the bulb. I get my plants w/in 6" of the bulb...As close as possible...Good luck!
                        If I\'m gonna stumble and fall, I want to fall forward.

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                        • #13
                          by experience only, i am with JW

                          put them as close as you can without burning them, but still keeping them all in good light. the hand technique works very well
                          if you don't like fire then don't come around, cause i'm about to burn one down

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                          • #14
                            your plants will not break soil in one day , you gotta use patience bro, give them a few days, your expectations are high , just don't get dissapointed if it takes them a while to break soil level and open up....just make sure to control that heat!

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