Things to know about lighting - Page 14

Stoned4life · #**131** 05-03-2008, 02:12 AM

Any Info on LED Lighting. I started a small hydro garden ( 5 gallon container / 5 plants ) using LED lights ( Total 80 Watts / 2 red 1 blue light) on 4/15 plants are @ 6" and to me seem to be growing nicely ( roots are in resevoir) any reccommendations on flowering. Im a bit nervous that as the plants grow they will not receive ample light. Room is completely covered in mylar.

A Good Keen Man · #**132** 05-04-2008, 02:05 PM

Quote:

Originally Posted by Stoned4life

Any Info on LED Lighting. I started a small hydro garden ( 5 gallon container / 5 plants ) using LED lights ( Total 80 Watts / 2 red 1 blue light) on 4/15 plants are @ 6" and to me seem to be growing nicely ( roots are in resevoir) any reccommendations on flowering. Im a bit nervous that as the plants grow they will not receive ample light. Room is completely covered in mylar.

Hi there, this note is just to say that I'm very interesed in hearing how you (or anyone else for that matter) get on with the LED setup. Is the 80 Watts the actual electrical drain or an eqiv to, say CFL light output. Personally, I think that LED will be the way to go if all works out. Best of luck. PLEASE keep us informed.

Enigma · #**133** 05-04-2008, 08:16 PM

There is a full LED grow going.. check the grow journal section!

brettearl · #**134** 05-08-2008, 09:36 AM

does anyone have proof of using fluorescents from start to finish and getting descent bud?

Wikidbchofthewst · #**135** 05-08-2008, 12:24 PM

Quote:

Originally Posted by brettearl

does anyone have proof of using fluorescents from start to finish and getting descent bud?

In SeeMoreBuds' book he uses CFL's from start to finish and yields 8 oz.

colem8 · #**136** 05-09-2008, 01:43 AM

Help. Ive been growing these Ice plants for 5 weeks now under a 400watt'er. There are 5 of them and some of them are beginning to develop these bud type things (the pics below explain better than i can). Can someone please help!! Are these male, female or to young to tell yet????
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Wikidbchofthewst · #**137** 05-09-2008, 08:25 PM

It's a boy!

TomThom1987 · #**138** 05-14-2008, 08:19 PM

it is defently a very manly plant

ganjagoddess · #**139** 05-20-2008, 12:04 PM

Quote:

Originally Posted by matth82003

How much light is needed?
The minimum amount of light required by marijuana plants is around 3000 lumens per square foot. However, it's not 100% 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 reflectivity of the grow box. The ideal amount is somewhere around 7000-10,000 lumens/sqft, and as long as the plants do not burn, as much light can be used as you want.
(*note, the sun produces about 10,000 lumens/sqft, on a sunny summer day).

Determining lumens for your grow area:
Determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet)
If you have a 1000 watt High Pressure Sodium, that produces (approx.) 107,000 lumens.
Divide this by 16 (your square footage) 107,000 / 16 = 6687 lumens per square foot.
So just divide the total amount of Lumens, by the total amount of Sq ft, and thats your lumens per square foot.

HPS light = 150,000 lumens.

at two feet above a 4X4 growing area.

at one foot from light 75,000 lumens

at two feet 37,500 lumens/4x4

2343LUMENS per square foot. probally only 2000 or less on the edges..

Now you see just how innefficient even 1000 watt HPS lights are compared to the suns mighty beat down of over 10,000LUMENS on any given surface...

Sorry but the two paragraphs up above contradicted themselves...

I had to clarify how light works...

nbc06c · #**140** 05-21-2008, 05:22 PM

I have would like to know if a 500wt light is ok for 3 plants in an open room when they're about 4 feet under the light.