[Ganoderma]

Okay we all know that the big halid in the sky very bright, so let me get to the point

in one sq. foot of light from the sun would = how many lumes, and then as a result how many HPS lights or MH light would it take to = that same amount of light out put


wasn't sure if this was the right Forum for this or not?

[BombSquadron65]

A bright sunny day is roughly 10,000 to as high as 13,500 lumens. However, optometrists rate a bright sunny day as between 8,000 and 10,000 lumens. Shade is between 2,500 and 3,000 lumens.

-edit- Keep into account that all these are per sqft. Sunlight is typically measured as lux (amount of light hitting 1 square meter = 9sqft) and a bright day is rated between 30klx (kilolux) and 100klx.

[Guest423]

no wonder they love my 143,000 lumen hps then lol

good info bomb

peace

[BombSquadron65]

Yep! Sun's damn bright!

So, technically if you limit a 150HPS into a 1'dx1'wx2'h space you are equating the intensity of the sun on a bright day! WOW!

[NiteTiger]

Originally Posted by BombSquadron65

Yep! Sun's damn bright!

So, technically if you limit a 150HPS into a 1'dx1'wx2'h space you are equating the intensity of the sun on a bright day! WOW!

In intensity, maybe, but not in spectrum. You can't come close to the sun for plants

[BombSquadron65]

True.

sure ya can

flower under a sodium + a halide. and 'full spectrum' flourescents to supplement.

theres a longgggg thread on this here somewhere, lemme see if i can dig it up...

[BombSquadron65]

Cool! Please do jack!

[Ganoderma]

you don't have to pay for sun light, grow lights cost money to run, but each have thier own up sides and down sides.

So technically speaking, you'd need about 150 watts per sq foot to match what the sun putts out, with a normal hps bulb,

a 400w hps would need to be limited to about 3.7sq feet

a 600w hps would need to be limited to about 6.8sq feet

a 600w hps would need to be limited to about 10.3sq feet

to get the same lumes or lux as what the sun puts out but with same ballance in the light spectrum

Ganoderma : thank you
but i think theyre talking about the sun's uv-b radiation and it's effect on potency, henceforth usin a mh in flower to add them UVBeez.
ps- if you ask any cash cropper theyll tell you 150/sq. ft. (or better) is ideal.

anyway, i couldnt find the thread for ya, BS65, but again, use a halide and hps combo + Full Spectrum Flourescents, for all spectrum light..
it works best in my, and many others experience. even in veg.

PLUS uv-b from the halide = theoretically higher potency product,

IME, red spectrum = lush growth, blue=tighter more compact growth

it really cant hurt to use both.
your plants and patients will love you for using the combination

be well