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Thread: 250W CFL distance from plant

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    Default 250W CFL distance from plant

    Hi folks i am wondering if anyone can help me here. I have a single 250W CFL about 8 inches above my seedling. I have done the hand test and it does get quiet a bit hot. I have 1 air moving fan which blows on my light and disperses the heat but its not blowing on my 3 day old seedling. Are there any guidelines to stick to in regards to the light becoming ineffective at a certain height? I fried a seedling by placing it at 3 inches away the heat was too much. Thanks
    BN

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    I have a 300w about 10-12" above my veggies at the moment, big fan blowing over the top and temps still get to 29-30

    I would put at 12-15" for a seedling, very easy to toast at that stage

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    Thank you. Yeah im getting temps of around that. My room will be cold in winter and hot in summer lol

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    250w CFL? 2" at most....
    “Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.”

    (Benjamin Franklin)




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    I agree with MC, I'd have mine 1" away.😉
    You need to get your ventilation right the temps will lower. I use a 300w CFL, you must keep it dust free otherwise it really heats up.


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    Last edited by Ironman; 27-07-18 at 04:25 PM.

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    Quote Originally Posted by ironman View Post
    I agree with MC, I'd have mine 1" away.
    You need to get your ventilation right the temps will lower. I use a 300w CFL, you must keep it dust free otherwise it really heats up.


    Sent from ⚒Thames Iron Works⚒
    Is that 2" away with a fan oscillating ? i only have a fan that does not oscillate and its pointed at my light and reflector

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    Quote Originally Posted by BigNasty View Post
    Is that 2" away with a fan oscillating ? i only have a fan that does not oscillate and its pointed at my light and reflector
    Does your lamp sit vertically or horizontally?

    I've always used horizontal. Those lamps are too heavy for the reflector and that's a good thing. Get the bulb level and the reflector will be higher on the open end. I place a fan underneath the fitting end so the hot air travels straight up the reflector and away from the plant. Doesn't need to be oscillating either.

    Let me see of I've got a pic to show you what I mean. I'll be back😉

    Sent from ⚒Thames Iron Works⚒

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    Quote Originally Posted by ironman View Post
    Does your lamp sit vertically or horizontally?

    I've always used horizontal. Those lamps are too heavy for the reflector and that's a good thing. Get the bulb level and the reflector will be higher on the open end. I place a fan underneath the fitting end so the hot air travels straight up the reflector and away from the plant. Doesn't need to be oscillating either.

    Let me see of I've got a pic to show you what I mean. I'll be back

    Sent from ⚒Thames Iron Works⚒
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    like this you mean
    I have nothing but time man. There it is. TIME. Something everyone has. Just gotta know how to use it!
    Mixed grow log https://www.thctalk.com/cannabis-foru...post1070814207

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    Quote Originally Posted by ironman View Post
    you must keep it dust free otherwise it really heats up.
    That explains a lot

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    Quote Originally Posted by ironman View Post
    Does your lamp sit vertically or horizontally?

    I've always used horizontal. Those lamps are too heavy for the reflector and that's a good thing. Get the bulb level and the reflector will be higher on the open end. I place a fan underneath the fitting end so the hot air travels straight up the reflector and away from the plant. Doesn't need to be oscillating either.

    Let me see of I've got a pic to show you what I mean. I'll be back��

    Sent from ⚒Thames Iron Works⚒
    Mines sits horizontal. Just like the one Grassmaker posted there only a little bit higher from my seedling.

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    Quote Originally Posted by BigNasty View Post
    Mines sits horizontal. Just like the one Grassmaker posted there only a little bit higher from my seedling.
    I can't find any pics. 😕 does your shade run perfectly parallel to the bulb?

    Normally the weight of the bulb makes the shade point up slightly?

    Sent from ⚒Thames Iron Works⚒

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    Quote Originally Posted by ironman View Post
    I can't find any pics. �� does your shade run perfectly parallel to the bulb?

    Normally the weight of the bulb makes the shade point up slightly?

    Sent from ⚒Thames Iron Works⚒
    yeah it runs parallel to the bulb i have it on chains i even put a little spirit level on it to make sure lol bubble is in the middle. The reflector came with a little hanger that slots into the reflector and between the tubes of the bulb then you turn it and it stops the bulb from dropping at the end.

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    Here you go, this is what I mean.

    Fan behind blowing the air along the shade and out the top away from the seedling.

    Sent from ⚒Thames Iron Works⚒

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    I fucked things up a little last night. Im on day 4 and there doesnt seem to be much more progress the true leaves are deffo getting bigger in the last few days but a little slow i think. I lifted the plant to make sure it wasnt dead, its not dead it has crazy long taproot and the hairs are starting to elongate now. i watered her with root juice from Bio Bizz. I stressed her by lifting it out, when i went up to check progress this morning the plant was leant over 45 degrees but there has been a bit more progress today i give it a little water before i went to work and it is starting to perk up a little. i have just been giving it very little but often from a spray bottle just on the surface of the soil.

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    Quote Originally Posted by BigNasty View Post
    yeah it runs parallel to the bulb i have it on chains i even put a little spirit level on it to make sure lol bubble is in the middle. The reflector came with a little hanger that slots into the reflector and between the tubes of the bulb then you turn it and it stops the bulb from dropping at the end.
    I actually bent mine up a bit more, the shade with a CFL doesn't do much when you have small plants. When they get bigger you will need to spread the light more to cover the bigger plant, then you need the shade to be like yours is.

    You definetly don't want leggy plants with a CFL, you'll get really airy buds you have to try and keep them as low as possible to help harden the buds.

    Sent from ⚒Thames Iron Works⚒

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    All being well i will start lowering it slowly when theres more progress i just dont want to fry it like the last one lol. Plant is alright now not looking leggy

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    Quote Originally Posted by Ironman
    Here you go, this is what I mean.

    Fan behind blowing the air along the shade and out the top away from the seedling.
    Unfortunately, I'd have to remove the top of the fridge to do that

    These 2, 5 weeks old and 10-12" away, both 2ft wide and growing strong




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    Nice and healthy plants youv got

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    Click image for larger version. 

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    This is day 5 of an autoflower. I stressed it out a bit but does this look like progress?

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    Yeah you'll be grand matey. I find with seedlings, if you leave them to it, they will be fine. Keep your CFL no further than about 4 inches away and make sure it has some water and it will be fine. DOnt go giving it nutrients or anything for at least 3-4 weeks.

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