Enough light?
- Thread starter JimVarney
- Start date
cowell
Well-Known Member
I don't think you need that much light. It's not a ? really as CAN you use too much light, I think it should be more is this ENOUGH light for the plant.. the rest is a waste of money. one 1000watt should be just fine for that space.. I have an 8X12 flowering room with 2 1000 watters if that gives you any idea. I could likely get away with 2 600 watters as well.. but I want to make sure I too had enough light.
Really? You get bud using that little light in almost 100 sq feet?
GreyPoppyseed
Member
From what I hear and have read, 20watts per square foot is normal....your average (4 by 3) is around 240 watts...I'd say your good with 2000w 
Sgt.Sly
Well-Known Member
of course hes going to get bud. what would u use in that space?
If money wasn't an option the optimum light for 100 sq feet is probably close to 1,000,000 lumens.
cowell
Well-Known Member
There are minimum and maximum amounts.. minimum 25 watts per square foot max is 60.. I have a really neat calculator for that, you can plug in your #'s and it will help you figure your lights and ventilation requirements.
Yes, I am at the lower limit, I get that, but the space is really 7 feet by 11 feet of grow room floor. You can get 8X8 as a max for 1000 Watters.. 4X4 is optimal, but I can get by, and once I get a little more scratch, there will likely be another 2 going in.. but for now it'll work - on a light mover would be better, but I'll likely opt for more lights first.
http://www.cannaversity.com/cannaversity/idx.php/22/051/Lighting--Electrical/article/How-much-lighting-do-i-need-.html
Oh and money isn't what I was talking about being the factor to consider. You have a space that isn't looking for that much light. Do whatever you want, but there's no reason for it wasting your $.
and lumens don't add. You would need a 1 million lumen light to produce 1 million lumens.. you cannot get that by putting in 1 million bulbs that produce 100,000 lumens.. you will only have 100,000 lumens... weird little physics lesson for you.
Yes, I am at the lower limit, I get that, but the space is really 7 feet by 11 feet of grow room floor. You can get 8X8 as a max for 1000 Watters.. 4X4 is optimal, but I can get by, and once I get a little more scratch, there will likely be another 2 going in.. but for now it'll work - on a light mover would be better, but I'll likely opt for more lights first.
http://www.cannaversity.com/cannaversity/idx.php/22/051/Lighting--Electrical/article/How-much-lighting-do-i-need-.html
Oh and money isn't what I was talking about being the factor to consider. You have a space that isn't looking for that much light. Do whatever you want, but there's no reason for it wasting your $.
and lumens don't add. You would need a 1 million lumen light to produce 1 million lumens.. you cannot get that by putting in 1 million bulbs that produce 100,000 lumens.. you will only have 100,000 lumens... weird little physics lesson for you.
Sgt.Sly
Well-Known Member
Man i think your a bit off. On a cloudless summer day the sun is only giving about 20000 - 30000 lumens
Nope, sorry. The problem is that plants used to grow EXTREMELY large outdoors. I'm talking the average weed plant was maybe 80-100 feet tall. See the sun has been dying for several thousands of years, so we really don't know exactly how many lumens it used to be outside. I don't even think 1,000,000 lumens in 100 sq. is enough really.
cowell
Well-Known Member
Comment like that makes me think you really don't know much about growing and should go do more reading. So now it becomes.. do I even want to try and explain this to you. Optimum reflection from tin foil? ok.. no.
Mylar...
and if you grew 3 oz with 180 watts of light.. (and I'm sorry but yes, my bullshit alarm has gone off..) then why would my 2000 watts not produce?
you're definitely closer than him. It's more like 32,000 to a top end of 100,000 lumens at Earth's surface. But it's similar to the lumens produced from a HPS.
Working backwards a little, the sun's total output without the earth's atmosphere in the way is about 1350 W/m². About half that is visible light, and the luminous efficacy of the solar spectrum is about 199 lm/W, so we get roughly 135,000 lumens/m². At the distance of the earth's orbit this energy falls on an imaginary sphere with a radius of 150 million kilometers, or 1.5 x 10^11 meters. The surface area of this sphere is 4*pi*r², or 2.827 x 10^23. Multiplying this by 135,000 lumens per m² gives us 3.816 x10^28 lumens, or put another way 38,160 trillion trillion lumens. Of course, this is an approximation, but it gives you some idea of the order of magnitude we're talking about here.
I'm just trying to help.. if you know better than me about the physics of lights and effects of lighting on plants.. please go ahead and teach me more about it, I always enjoy learning.
You must take drugs or something
Bcmp
Member
hahahah omg 1 million lummens this guy actullary wants to put 2 1000w hps in such a little room you could use 1 wiht a recflector and it would be tons people grow great weed with compact fluoresent bulbs. 2000w of hps in such a small place it well be over 110F its gonna be a sonna hahah and dont say they dont produce heat... every light bulb does even compact fluoresnt lights and fluoresent lights so you cant tell me that 1000w hps doesnt produce heat
skywalker39963
Member
i would do two 250 watt hps and 4 t-5s
Sgt.Sly
Well-Known Member
+Rep big time for handing out useful information.