Optimum plant height for 400w hps flower?

kmo8762

Well-Known Member
How tall a plant can a 400w hps flower effectively? At some point the light won't penetrate the foliage, correct? Any help would be greatly appreciated. :leaf:
 
Im not sure I just hope your not using lucas electrical components to run your hps!ha ha.Gotta love those triumphs!!!Do you have a trident?I have had several twins.Have a BSA chopper im building now.Cheer mate.
 
2 foot from the plant top is the optimum length with a 400w HPS - Plants are pretty unpredictable in terms of height... if your plant gets too big, you could always tie it down a bit ? :D
 
You want your lights as close to the tops of your plants as possible without burning them. That is the rule of thumb always as light degrades the further away from the source you get.

Hang your light where you think, likely 8" from your tops (less if you have a cool tube) and hold your hand palm down at the tops of your plants, if the heat from the light hurts the back of your hand in 30 seconds, its too close, raise the light (or lower your hand) 2" and try again.

Little trick I picked up somewhere along the way, always worked great for me.

Oh yes, and watch as your plants grow to keep moving the light up so they dont get burnt.

TKG

2 foot from the plant top is the optimum length with a 400w HPS - Plants are pretty unpredictable in terms of height... if your plant gets too big, you could always tie it down a bit ? :D
 
also, even if teh temps are ok, say in winter, dont keep it closer than a few inchs. All winter I had my plants at the glass it was so cool. I ended up with some bleached buds, and that is not reversible. No closer than six for me. I try and keep at least eight. I see grows all the time and the buds a foot easy or more look pretty nice.
 
also, even if teh temps are ok, say in winter, dont keep it closer than a few inchs. All winter I had my plants at the glass it was so cool. I ended up with some bleached buds, and that is not reversible. No closer than six for me. I try and keep at least eight. I see grows all the time and the buds a foot easy or more look pretty nice.
I just had this problem with my 400 watter. I didn't think a 400 watter could bleach the bud like it did. Was I wrong or what. Here's a picture of one of the bleached buds next to one that was farther away from the light. It still smokes ok. Nothing wrong with it other then it got bleached.
 

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I don't think the OP wants to know how far away to put the light - they want to know how far the light penetrates, for instance - can it still penetrate a 6ft plant? 8ft? How big a plant will it penetrate?
I'm kinda curious about the answer myself...
 
I don't think the OP wants to know how far away to put the light - they want to know how far the light penetrates, for instance - can it still penetrate a 6ft plant? 8ft? How big a plant will it penetrate?
I'm kinda curious about the answer myself...
Bingo:leaf:
 
u mostly have to look at its genetics.. thats how u can tell if they will get big or what but none the less u can grow them big just depends on some strains. some of them are meant to be short and stocky
 
u mostly have to look at its genetics.. thats how u can tell if they will get big or what but none the less u can grow them big just depends on some strains. some of them are meant to be short and stocky
are you in the right thread or just plain ignorant? The guy wants to know about lumen depletion, do you know what that is?????????????:wall:
 
I don't think the OP wants to know how far away to put the light - they want to know how far the light penetrates, for instance - can it still penetrate a 6ft plant? 8ft? How big a plant will it penetrate?
I'm kinda curious about the answer myself...
HPS-Light-Distance-Chart.jpg


21 inches :clap:

Strip 10" of growth off the lower main stem and you have a 31 - 32" plant - not including the roots.
 
no just bored and felt like typing some random shit haha plus just woke up and still high from last night.
Thats code for 'I know bugger all but like poeple to think I do' I presume. People need sound advice not some 'random shit' and most of us on here are wasted so theres no excuse.:roll:
 
Im not sure I just hope your not using lucas electrical components to run your hps!ha ha.Gotta love those triumphs!!!Do you have a trident?I have had several twins.Have a BSA chopper im building now.Cheer mate.
06 Rocket III and 07 Tiger :mrgreen:
 
Thats code for 'I know bugger all but like poeple to think I do' I presume. People need sound advice not some 'random shit' and most of us on here are wasted so theres no excuse.:roll:

and some of us are dick heads that talk shit over a forums site like they are the shit
 
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