ArrOgNt RocKstAR
Well-Known Member
I'd like to know how many lumens the sun produces per square foot... like compared to a 1000 watt bulb.
Anyone have an idea?
Anyone have an idea?
How many lumens does the Sun produce per square foot?
- Thread starter ArrOgNt RocKstAR
- Start date
lulutheblack
Active Member
google it!
JimmyTheJaw
Active Member
found this https://www.rollitup.org/outdoor-growing/80350-how-many-lumens-does-sun.html not sure if its correct or not
lulutheblack
Active Member
well to technically answer your question it would depend on how far away from the sun you were and apply the inverse square law to your distance... Lumens have nothing to do with how plants use or see PAR light. Lumens is useful when comparing like for like lighting to know which one will have more intensity but higher lumens doesn't mean better. The spectrum of light is much more important... 100,000 Lumens in the green spectrum won't do shit for your plant...
fruitrollup
New Member
1400w per m2 so 1m x 1m gets 1400w but when you get bigger you square it
ArrOgNt RocKstAR
Well-Known Member
tree fiddy sounds about raght...
Captain Jaz
Active Member
10,000 lumens
MrSteroids1
Well-Known Member
I found this post by googling "how much lumen per square foot sun"
budman111
Well-Known Member
Fate, it seems is not without a sense of irony.
kvnbeach
Active Member
You are wondering around with a quote of mine. I am honored. I have a lumen reader, 10,000 is about right. So it is equivelant to a 250w halide. Difference is, it is 10,000 lumens anywhere on the plant. In otherwords, the light can actually penetrate through the canopy and reach lower leaves. A 250 cant do this from 93,000,000 miles. The sun does not lose intensity, but anything over a 400 produces more lumens to the canopy than the sun. You need a 1000w to be able to penetrate through the canopy. It's good to have he light hit the dirt with some intensity.
I said PENETRATE. ha ha ha hahahaha ha ha hahahahaha
| 1000 - 5000 lux | Min. necessary for life |
| 10000 - 15000 lux | Min. necessary for consistent but sparse growth |
| 20000 - 25000 lux | Min. necessary for robust growth |
| 25000 - 30000 lux | Max. Efficiency for Sub Tropical varieties |
| 25000 - 50000 lux | Max. Efficiency for Equatorial varieties |
[TH="bgcolor: #00ffff, colspan: 2"]Light Requirements of "High Energy" Plants[/TH]
90000 lux Max. Sunlight Intensity on Earth's surface This is too much light, it is not good for the plant.
Plants subject to intensities at this level or greater are at risk of "solarization," whereby photosynthesis is retarded. This can happen at noon on a clear Tropical summer day, especially at high altitudes.
140000 lux Sunlight above atmosphere (Solar Constant)
Hi I am new
I googled and all I get is rollitup forums 
But I have this book Kaiser's electrotechnical handbook from Dragutin Kaiser 1971 edition it has some pages about all kinds of different lamps in that time and there is also one table about characteristics of different light sources and among all light sources there is also:
Sun 30° above horizon colour temp. 5200 K | efficiency of light source lm/W= ---(no data) | luminance approximately = around 75 000 sb or cd/cm^2
Sun in zenith(heyday) or sun at it's peak colour temp. 5200 K | efficiency of light source lm/W=---( no data) | luminance approximately = around 225 000 sb or cd/cm^2
1 sb or 1 Stiebel is 1 cd/cm^2
I tried to find how much lumens is that and all I can find that 225 000 cd/cm^2 is 2 250 000 000 lux which is 2 250 000 000 lm/m^2 or 2 250 000 000 lumen/square meter/steradian
1 lm/m^2 = 0.09290304 lm/foot^2
So 2 250 000 000 lm/m^2 is 209031840 lm/foot^2
It does not says anywhere on which latitude is this. I checked this calculations several times and I am pretty sure I made no mistakes, yes I am drunk a bit, but I still ask my self now how the fuck any plant can grow under any type of lamps. I am going to have to recheck this tomorrow again
SpaaaceCowboy
Well-Known Member
SnapsProvolone
Well-Known Member
Fire up a 1kw hps outside on a sunny day. You won't notice the hps.
