Lumens, Lux, and Adding It all Up

homegrownboy

homegrownboy

Well-Known Member
[quote="Garden of Weeden";1718335]hey, this isnt relevant to what everyone is talking about, but all i want to know is if i go out and buy an ordinary Ultraviolet light, will i be able to use it to grow my weed? im not realy intrested about fancy stuff lol, im growing it in my wardrobe btw ![/quote]

NO!!!!!!!!!!!!!!
 
herballuvmonkey

herballuvmonkey

Well-Known Member
This is a very good post but i think there should be a little more stated about PAR lighting. I have done some investigation and have concluded that you need about 85 par watts /sq. meter. That is optimum for 1 sq. meter which is approx. 10.75 sq/ft. A 400 w HPS gives off about 128 -130 par watts per sq meter. So to find out how much par wattage for sq. ft u would divide it out (85/10.75=7.91) then multiply that by ur sq ft. (5*7.91= 39.55 so 40 par watts for my grow boxes ) would be optimum par wattage. Since I use 400 w HPS's I would have 3x's the optimum amount of par wattage for my plants and they should grow to be healthy and yield some good bud. ( and they do :) ) Anyone can do this with your sq. footage and a calculator.
 
Mystery101

Mystery101

Well-Known Member
^^Glad I read it^^

I have a 2'8"x2'8"x5'2" space.(tent) with a 400 with a cool-tube.
If your seeing good results mine should be a lil better:mrgreen:
 
K

kivalovski

Active Member
If I have one 1000W hps it gives about 150K lumen.

1 600W gives about 90K lumen.

My question is if 2 600W gives the dubbel amount of lumen, 180K lumen?


I`w read somewhere that 2 lights dosen`t dubbel the lumen.
 
herballuvmonkey

herballuvmonkey

Well-Known Member
kivalovski u are right and wrong at the same time. 2 600w would only double the intensity where the light overlaps. In the further out places you would still only get the 90k lmns. Still I say Par minimums is what we should be striving for. Lumens are for humans Par is for plants
 
Irie Hawaii

Irie Hawaii

Well-Known Member
ceestyle said:
It will. What will be especially interesting is to compare the light distribution.

By the numbers, each should provide about the same lumen count.

6 x 42W = 6 x 2700 lumens ~ 16200 lumens

1 x 150W HPS ~ 16000 lumens

There will be errors due to my cheapass HPS and the different spectra, age, etc., but we should be able to get the point.

What is especially interesting is that at the corners we should see better coverage from the CFLs, as they're closer, while at the center, the HPS should be better. And of course all of this will change with the distance from the canopy.

Let experimentation begin! (but after dark, 'cause it's hot as shit in this room atm)
Click to expand...
(6) * 42W = 252 watts. why not get a 250 watt HPS? same price in electricity. isn't that like 25000 lumens or something?
 
bubblegumdude

bubblegumdude

Active Member
hey can someone tell me the answer to this
how many foot candles is sunlight on an average sunny day in afghanistan?

whats the max useable footcandles that a plant needs to grow optimum ..
 
Hooker

Hooker

New Member
lilb2662 said:
i got three baby plants i was wondering what wattage bulb i should use for that
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if you use CFLs then you should use at least a 40 watt CFL for each... 7k to 10k lumens per sq foot is supposed to be ideal. Each 40 watt is like 2700 lumens I think so if you put all the plants within a square foot that would be like 8k lumens.
 
lilb2662

lilb2662

Active Member
Hooker said:
if you use CFLs then you should use at least a 40 watt CFL for each... 7k to 10k lumens per sq foot is supposed to be ideal. Each 40 watt is like 2700 lumens I think so if you put all the plants within a square foot that would be like 8k lumens.
Click to expand...
sweet thanks
 
Freedom23

Freedom23

Well-Known Member
what would the lux be for an area that is 16'' deep , 28'' long and 17'' high

6 15w CFLs (6,500k , 900 lumes each)
3 45w CFLs (6,500k , 3,000 lumes each)
 
alg007

alg007

New Member
i was inquiring at the hydro store about my veg room set up and he was 100% pro flourescent kept me on track
 
L

lorenzo08

Well-Known Member
alg007 said:
i was inquiring at the hydro store about my veg room set up and he was 100% pro flourescent kept me on track
Click to expand...
have you ever used a hps? it's amazing how much light you get with one. you need a lot of cfl's to get the same amount of light. I think cfl's are good for up to 3 plants. more then that, and you will benefit from having an hid light. I still use cfl's. they give extra light to the sides and edges of the grow, and easy to work with for mother plants and clones. I have a 400 watt hps, but I think the 600 watt is well worth the extra money.
 
$that1dude$

$that1dude$

Active Member
lorenzo08 said:
have you ever used a hps? it's amazing how much light you get with one. you need a lot of cfl's to get the same amount of light. I think cfl's are good for up to 3 plants. more then that, and you will benefit from having an hid light. I still use cfl's. they give extra light to the sides and edges of the grow, and easy to work with for mother plants and clones. I have a 400 watt hps, but I think the 600 watt is well worth the extra money.
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I found someone selling a Sun Systems 400 watt Mh. He told me to give him a price, its slightly used, but everything works. heres a pic...what do you think a good offer might be? I checked out the Sun Systems page and they didnt have the exact same one but it was still a 400 watt Mh and brand new it was only 186.00 (US).
 

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trailerparkboy

trailerparkboy

Well-Known Member
im attempting my 1st grow...3 plants in a closet im was gonna use a 2ft 4 tube T5 with 2 6500k an 2 3000k tubes but now im thinkin this might not be nearly enough light any suggestion...also do those lights usualy come ready to go or will i need to do some wiring
 
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