yellowvin7
Active Member
about how many watts in a CFL per plant? what is too much?
? watts per plant?
- Thread starter yellowvin7
- Start date
RandyRocket
Well-Known Member
too much is when you have more heat they you can handle.
KushCanuck
Well-Known Member
If you want density, the more the merrier really, just make sure you can vent your space, heat is a killer. Those lumen figures are only accurate if they're refected properly and mounted horizontally and I would say 3000 lumens minimum per square foot. Good luck
KC
KushCanuck
Well-Known Member
KushCanuck
Well-Known Member
Yes sir, however CFLs don't overlap with lumenage, they must be spanned over the canpoy. For instance two bulbs, one over the other, will not have any light improvement over one bulb. However, if you spread those bulbs apart, the bulbs cover more area and your 3200 lumens become more effective. Good luck
KC
RandyRocket
Well-Known Member
No,
Lumens is a measurement for area so you can't just add.
Square the lumen of each bulb then sum them up.
Take the square root of the sum = total lumens
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ex.
1600^2 = 2560000 * 2 (number of the same bulb) =5120000
sq rt of 5120000 = 2263 lumens for 2 bulbs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
It will take 4 of the same bulb to double the lumens.
Remember area = width x depth
iwantbud420
Active Member
How many lumens does a 400watt metal halide lamp put off I have 3 of these for veg and I have 3 400watthps for flowering
Gmaccin6
Well-Known Member
damn how many plants u growing
TeaTreeOil
Well-Known Member
Pretty much.
Absolutely incorrect. PAR efficiency is the ultimate measure of importance. CFL outclass HID.
It's more about direct light absorption.Agreed, thanks for chiming in bkstylz. It's all about coverage area
KC
Almost.
'Light' is additive. This is a property of electromagnetic radiation.Yes sir, however CFLs don't overlap with lumenage, they must be spanned over the canpoy. For instance two bulbs, one over the other, will not have any light improvement over one bulb. However, if you spread those bulbs apart, the bulbs cover more area and your 3200 lumens become more effective. Good luck
KC
You are wrong.
Wrong again. But closer.. maybe? Light is additive. More photons in the proper wavelengths = more photosynthesis.
iwantbud420
Active Member
I have 12 right now. 6 are ice plants and the others a some crossbreed not exactly sure but I would definately like to get more as soon as the snow melts I have a 20 acre field that has been screaming my name all winter
RandyRocket
Well-Known Member
You are wrong.
Wrong again. But closer.. maybe? Light is additive. More photons in the proper wavelengths = more photosynthesis.
It's the correct formula, look it up.
RandyRocket
Well-Known Member
If it put out 30,000 lumens and you focus all three bulbs on the same 1 foot sq then
30000^2=900000000
900000000 x 3 = 27000000000
sq rt of 27000000000 = 51961 lumen
but I don't think you can put these close enough to combine the light.
TheScorpion420
Active Member
around 36000
Roseman
Elite Rolling Society
Light seen and perceived with the human eye is measured in Lumens. There is an ideal amount of lumens for growing and a minimum amount of required lumens. The very minimum amount of light required for smaller sized plants grown is around 3000 lumens per square foot. Let me put emphasis on "minimum amount" of light. However, that's not 100% exactly accurate, since although you may have a 10,000 lumen light, the amount of light that reaches the plant varies with the distance between the light and plants, and the reflectivity of the grow area. The ideal amount is somewhere around 7000-10,000 lumens per square foot for average sized plants. As long as the plants do not show burn, as much light can be used as you want to use. (Note, the sun produces about 10,000 lumens per square foot, on a sunny mid summer day).
Determining lumens for your grow area:
First determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet, 2 by 2 feet is 4 Sq ft. ) If you have a 1000 Watt High Pressure Sodium Light Bulb, that produces approximately 107,000 lumens. Divide this by 16 (your square footage) 107,000 divided by 16 = 6687 lumens per square foot. So just divide the total amount of Lumens, by the total amount of square feet, and that's your lumens per square foot.
Determining lumens for your grow area:
First determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet, 2 by 2 feet is 4 Sq ft. ) If you have a 1000 Watt High Pressure Sodium Light Bulb, that produces approximately 107,000 lumens. Divide this by 16 (your square footage) 107,000 divided by 16 = 6687 lumens per square foot. So just divide the total amount of Lumens, by the total amount of square feet, and that's your lumens per square foot.
Determining lumens for your grow area:
First determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet, 2 by 2 feet is 4 Sq ft. ) If you have a 1000 Watt High Pressure Sodium Light Bulb, that produces approximately 107,000 lumens. Divide this by 16 (your square footage) 107,000 divided by 16 = 6687 lumens per square foot. So just divide the total amount of Lumens, by the total amount of square feet, and that's your lumens per square foot.
Determining lumens for your grow area:
First determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet, 2 by 2 feet is 4 Sq ft. ) If you have a 1000 Watt High Pressure Sodium Light Bulb, that produces approximately 107,000 lumens. Divide this by 16 (your square footage) 107,000 divided by 16 = 6687 lumens per square foot. So just divide the total amount of Lumens, by the total amount of square feet, and that's your lumens per square foot.
TeaTreeOil
Well-Known Member
It looks like you're doing a^2 + b^2 = c^3, which is how a right triangle's sides(lengths) are related.
I don't see how it's related to lumens.
Adding lumens is as simple as adding lumens.
9inch bigbud
Well-Known Member
absolutely tosh no they dont "par is fuck all with out intensity. dont forget plants use every color in the light wave lenth exept green because thats the color they reflect back. I agree that red and blue is the most usable light by plants but its not the only color they use. hid slam out more light per watt than any light curantly avalabe to the home grower. thats why LED light is shit for growing buds there is no intensity from them, hids are good because of the over spill of all colors at high intensity. PAR may look good on paper, but it does not look good on your plants when it comes to using a HID. also MH (HID) as a beter PAR rating than a CFL and even an HPS hands down, but the HPS grow bigger buds why is that if PAR is the ultimate of importance? as i have said it all looks good on paper. but the truth is plants dont grow on paper they grow under light the more the better no matter what color it is so long as its not green.