How far are your 1000w bulbs? - Vertical / Colosseum Growing - International Cannagraphic Magazine Forums

growclean · 01-04-2010, 11:43 PM

So I am still trying to finish our flowering room and will be using 1500w hps bulbs hung open air vertically. I am trying to gauge how big to try to make our screens around the bulbs. I had found a post with lumen chart and distance from bulbs. It would seem the optimal distance would be about 13 inches, so I would make a 26 inch screen around the bulbs. But is this too close? How close are your bulbs?

bballsk8er333 · 01-05-2010, 12:08 AM

its not 13 inch, because even thought that may be 100% lumen efficiency, when adding one more distance, it can be times by 3.14 (pi*diameter), thus when adding 6 inches to the distance on both sides, or 1 foot in diamter, the allowable plant area to grow under light is 12"*3.14, meaningf extra 36 inches, now times that by the lenght (height in our case) and the numbers start to take off. I believe a 600 w that i saw was 1.5 feet away from bulb, but I have never done vert, just know 13 inches would not work good at all.

more help from the experts ?

growclean · 01-05-2010, 12:32 AM

OK, thanks, that is a good start. Anyone else.

thehiena · 01-05-2010, 04:26 AM

the ratio of my cage is 17 inches and I still think is too close to the plants.

Maybe this chart could help..

growclean · 01-05-2010, 08:28 AM

Quote:

Originally Posted by thehiena

the ratio of my cage is 17 inches and I still think is too close to the plants.

Maybe this chart could help..

Thanks! That is way different than the chart that I have. So what do you all think that I should start with for a 1500w bulb?

Fat J · 01-05-2010, 08:35 AM

Maybe about 20-22"... better to not burn em.

johnnyla · 01-05-2010, 08:36 AM

some branches of mine are 12" away from the bulbs but between 12-24" they are lovin' it.

johnnyla · 01-05-2010, 06:54 PM

anyone else????

redspaghetti · 01-05-2010, 07:47 PM

I never use 1500 bulbs so i dont know but i do use 1k and i place mine 18 - 36 inches from the light and they seem happy ? some of the one that is closer then 18 get tip burns and such but very minor.

Cheers,

Mr Celsius · 01-07-2010, 07:47 AM

Its not lumens, its heat and the amount of plants that you want to get coverage.

The closer it is, the less plants and the less yield. If you're not cooling then you get burn.

I don't know why you're using 1500w bulbs, they are a bad idea... high inefficient in every respect.

01-04-2010, 11:43 PM	#1
growclean Grow Clean.... Go Fast! Join Date: Oct 2009 Location: Indoors under a bright sky... Posts: 1,001	How far are your 1000w bulbs? So I am still trying to finish our flowering room and will be using 1500w hps bulbs hung open air vertically. I am trying to gauge how big to try to make our screens around the bulbs. I had found a post with lumen chart and distance from bulbs. It would seem the optimal distance would be about 13 inches, so I would make a 26 inch screen around the bulbs. But is this too close? How close are your bulbs?
	Quote

01-05-2010, 08:35 AM	#6
Fat J Professional Joint Roller Join Date: Dec 2009 Location: Like, here man! Posts: 456	Maybe about 20-22"... better to not burn em. __________________ "Any country which is willing to give up a little freedom for a little security deserves neither and shall lose both." -Ben Franklin -==FAT j==- <Really, Don't Click Here! I warned you...> *100% Prop 215 compliant (SB420 struck down!)* ***Now with 420% more cowbell!* GrandDaddyPurpz NorCal Style - 2k, CoCo, recirc, chronic. 2010 - The MaZe - 2.4kW of FuNkalicious Floral Fatness 2009... ebb-n-flow system - 4x4 1k**
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01-05-2010, 08:36 AM	#7
johnnyla Senior Member Join Date: May 2009 Posts: 1,149	some branches of mine are 12" away from the bulbs but between 12-24" they are lovin' it. __________________ ALL CANNABIS USE IS MEDICINAL Prop 215 and S.B. 420 Compliant.
	Quote

01-05-2010, 06:54 PM	#8
johnnyla Senior Member Join Date: May 2009 Posts: 1,149	anyone else???? __________________ ALL CANNABIS USE IS MEDICINAL Prop 215 and S.B. 420 Compliant.
	Quote

01-07-2010, 07:47 AM	#10
Mr Celsius I am patient with stupidity but not with those who are proud of it. Join Date: Aug 2007 Location: In my head Posts: 2,087	Its not lumens, its heat and the amount of plants that you want to get coverage. The closer it is, the less plants and the less yield. If you're not cooling then you get burn. I don't know why you're using 1500w bulbs, they are a bad idea... high inefficient in every respect. __________________ A plea for your Health (look at this) HP Stadium Organic Pest Control Organics for Beginners BigTokes ~ Basic Water Chemistry!! ALL ABOUT BONSAI MOMS/MUMS Yayyy! My first colloidal silver generator The 6k Stadium that foil tape built Nature is like a brilliant opponent in chess: "We know that his play is always fair, just and patient. But also we know, to our cost, that he never overlooks a mistake, or makes the smallest allowance for ignorance." - Thomas Henry Huxley "Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power." -P. J. O'Rourke
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01-05-2010, 12:08 AM	#2
bballsk8er333 Member Join Date: Feb 2008 Posts: 34	its not 13 inch, because even thought that may be 100% lumen efficiency, when adding one more distance, it can be times by 3.14 (pidiameter), thus when adding 6 inches to the distance on both sides, or 1 foot in diamter, the allowable plant area to grow under light is 12"3.14, meaningf extra 36 inches, now times that by the lenght (height in our case) and the numbers start to take off. I believe a 600 w that i saw was 1.5 feet away from bulb, but I have never done vert, just know 13 inches would not work good at all. more help from the experts ?
	Quote

01-05-2010, 12:32 AM	#3
growclean Grow Clean.... Go Fast! Join Date: Oct 2009 Location: Indoors under a bright sky... Posts: 1,001	OK, thanks, that is a good start. Anyone else.
	Quote

01-05-2010, 04:26 AM	#4
thehiena New Member Join Date: Jan 2010 Posts: 3	the ratio of my cage is 17 inches and I still think is too close to the plants. Maybe this chart could help..
	Quote

01-05-2010, 07:47 PM	#9
redspaghetti love machine Join Date: Oct 2009 Location: South America Posts: 3,727	I never use 1500 bulbs so i dont know but i do use 1k and i place mine 18 - 36 inches from the light and they seem happy ? some of the one that is closer then 18 get tip burns and such but very minor. Cheers,
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