Quote Originally Posted by bejay
the sun may not be able to penetrate foilage or shaded areas but it does not lose its intensity like a light for every foot it loses half of its intensity.
ok if you have 140,000 lumens at 1 ft away to begin with and you lose half its intensity for every foot away the light is and at 4 ft I get 17,500 lumens in a 16 sq ft garden with a 1000 watt lamp 4 ft away that would be 1094 lumens per sq ft.
there is a link below that explains lumens and lights in more detail.
http://www.hydroempire.com/store/hyd...osynthesis.php

BJ you should check the math.

Page 179. Marijuana Horticulture - Jorge Cervantes

1000w 140 lumens per watt.

1foot(30cm) 140,000 lumens
2feet(60cm) 35,000
3feet(90cm) 15,555
4feet(120cm) 9999( this is your target. anything more is wasted)

That is assuming you are not using a Solarmax or hortilux bulb which would be more lumens.

10,000 lumens to your canopy at 4 feet. The light is also gives you better light distribution which equals a more even canopy.

4x4 = 16sqft, 1000w / 16sqft = 62.5 watts per sqft.


BJ please explain your grow show and it might explain your take on the subject? Are you closet growing? The facts are there for you all to see.

Gnome? any data to support your point to keep lamps so close?

Bear...Can you repost the link?

Jay