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Thread: What distance should my light be from my plants?

  1. #21

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    i have a 400 watt hps am in to flowering 2week how far do you think it should be 1 foot seem a lil to hot if you ask me i dnt have very good air flow ?????? but she still growing have it about 2 foot away ???????

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    Quote Originally Posted by keenforgreen View Post
    i have a 400 watt hps am in to flowering 2week how far do you think it should be 1 foot seem a lil to hot if you ask me i dnt have very good air flow ?????? but she still growing have it about 2 foot away ???????
    2ft a little far away for a 400w you want to go about 15"-18" away
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  4. #23

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    yeah i have it at 18 now

  5. #24

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    you can have your hid as close as 6 inches aslong as you got cool air blowing the heat away,fan clipped to the shade should do this perfectly. i however choose to have the light at the top of my room(6ft maybe) as the plants stretch up to it. it makes the bottom branches stretch way out to so they get more light and i get more top kolas.

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  7. #25

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    Hey all. Not strictly on subject but I was wondering about which light to use on my flowering cycle... I have read and read and read but I'm still not 100% so I thought I'd just come out and ask...

    I'm vegging under a 250W cfl and was thinking of changing to a red cfl for flowering. My question is: should it also be a 250W or should I be getting the 150W one? And I was also wondering what would happen if I bunged a couple of extra red lights in there with it... Would that increase my yield / shorten flowering time or just be a creative way of wasting my money..?

    Any advice is appreciated...

    Cheers,

    Davey
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  8. #26

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    Quote Originally Posted by daveybaby View Post
    Hey all. Not strictly on subject but I was wondering about which light to use on my flowering cycle... I have read and read and read but I'm still not 100% so I thought I'd just come out and ask...

    I'm vegging under a 250W cfl and was thinking of changing to a red cfl for flowering. My question is: should it also be a 250W or should I be getting the 150W one? And I was also wondering what would happen if I bunged a couple of extra red lights in there with it... Would that increase my yield / shorten flowering time or just be a creative way of wasting my money..?

    Any advice is appreciated...

    Cheers,

    Davey
    I was always told to double your output when flowering but I'm a noob also.

  9. #27

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    How far should a 400W HPS be from three day old seedlings?
    Have read different things and I'm unsure.

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  11. #28

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    20cm - 250w hps

  12. #29

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    Quote Originally Posted by Stone-R View Post
    How far should a 400W HPS be from three day old seedlings?
    Have read different things and I'm unsure.
    1 2 foot depends on fans

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    Calciumkid (16-02-12)

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    Quote Originally Posted by stone14 View Post
    what about dual spaec lamps? im getting a 600w hps/mt lamp so how close?

    I have just started using a 600w dual spec.... i first put the hood down to about 6-7 inches...and burnt the leaves, it is now about 10inches and all seems well... at 6 days they are now 7.5 inches...result!

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