Too much light? Is it ever OVERKILL?

[SCIENTIXT]

I have a grow cabinet and I just got a 1000w HPS for it. I know that a 1000w is enough to cover an 8' x 8' space and I cut that down to a 4 1/2' cabinet. Does anyone think that this is too much light for this space?

[orangeman]

The intensity of the light is never a problem (I don't think), I think it's just the heat and temperature that might be a problem. If you can control that then it should all be fine :).

[SCIENTIXT]

Sounds good. I have an in-line duct fan hooked up to it to keep the temp down. The cabinet temp is at 79.2 degrees with the fan on at about 1/3 power. I can turn up the speed of the fan and adjust the temp but the noise of the fan is the issue for me right now. Thanks for the reply orangeman.

HAPPY GROWING!!!!!!!!!!!!!!!!!:)

[xcrispi]

suposedly after 50 w. per sq. ft. a plant can't utilize much more .
if it's too much you'll be the first to know via. light stress . cab. temps are fine so far at 79deg.
peace
crispi

[Completely Stoned]

More light = More bud. Plain and simple. Just KEEP those temps Down. It stresses the hell out of plants when its always 70 degrees then all the sudden 100 degrees.

[Volker]

More light = More bud.Usually. 99.9% of the time, this is the case.

BUT!

I have personally seen an example of a plant receiving "too much light"(?). Guy had a single plant under a 1000W HPS in a small room, mylared to hell, and it "bleached". So much light that chlorophyl production was severely retarded(?), and plant looked pale yellow - straw coloured - in normal light. Still grew and yielded, but not much.

There may have been other factors involved, but when I saw it, temp & humidity were OK, and everything else looked OK.

So yes, I believe it's possible to have too much light.

[Shallow Hal]

u wanna see what 1200 watt of hps can produce in a 4x4 room . look at the pic, the averages out at 75 watts per square foot. also i have my room mylared. as far as having too much light , well there aren't much brighter light sources than the sun and guess what weed nomally grows under it , so ur theory about too much light is kinda silly if u think about it , it sounds more like heat stress and bad ventilation that killed ur friends plant.

[Volker]

so ur theory about too much light is kinda silly if u think about it , it sounds more like heat stress and bad ventilation that killed ur friends plant.Dunno. Like I said, could have been other factors, and prolly were. And plant didn't die, it lived & produced, was just very pale & weak. And I know it sounds weird. In just about every situation I've seen, you'd get super-wazoo results like you did, and that's to be expected.

But I do still believe it possible - under the right (very special) circumstances - for a plant to get "too much light". You'd have to work hard to make it so, but I think it is possible.

[Weedhound]

if your light falls on your plant and crushes it.....you have too much light....Hal..NICE bud btw.

[orangeman]

Usually. 99.9% of the time, this is the case.

BUT!

I have personally seen an example of a plant receiving "too much light"(?). Guy had a single plant under a 1000W HPS in a small room, mylared to hell, and it "bleached". So much light that chlorophyl production was severely retarded(?), and plant looked pale yellow - straw coloured - in normal light. Still grew and yielded, but not much.

There may have been other factors involved, but when I saw it, temp & humidity were OK, and everything else looked OK.

So yes, I believe it's possible to have too much light.

Of course if you have soo much light in such a little room it may cause problems but think about it. The sun is way more intense than a 1000w light bulb but the plants are out in the open and that allows that plant to receive as much light as needed. If your conditions are right there can never be a such thing as too much light.

[Shallow Hal]

thx mate

[Weed4Life]

Sweet buds shallow hal. good work. I might think about upgrading in one of my future grows. Keep them green!

[budsmoker only]

dont know much about "to much light" but i know that those buds look delicious..

[Flower Child]

We will be running 1000 HPS 400 MH cool tube that will cover about 4x4...
expecting good things.. but with 10 day veg.. I don't think huge... but nice and fat and easy to trim... super skunk
I had some bleaching issues before in my Green House... usually the girls were not ready for that much light....cal-mag seemed to help...
FC

[Caligreen]

hey,

I bleached a few leaves on a plant earlier by putting it too close to a 400 watt mh... the two leaves went white, i moved the light higher and it recovered well, so just keep an eye on it...

I think that you might worry more about becoming inefficient. that much light in that small an area will grow some big dank buds, but is it worth the extra cost in electricity? Its not cheap and you can still pull down some great weight with less... you definately have some diminishing on yeild per watt, if you size down to a small space. I am not certain about this, but I imagine that at some point, the size of the root structure, and the levels of c02 could become factors limiting the ability of your plants to actually use all that light.

do you have room to expand?

[Garden Knowm]

I saw 4 - 600 watt bulbs 10 inches from the top of 50 plants growing SOG.... in a 4x6 area...

The tops of the plants turned white like VOLKER said... and they stopped growing....

I did some research and found out that this actually happens in nature at very very high elevations...

the lights were raised and the tops of the plants turned green again.. and the plants ended up giving a monster yield....

Like VOLKER said, it fooked up the chlorophyl... but it did not kill the leaves... but it did STOP growth.... it is very difficult to achieve this indoors....

cheers

PS.. MR. HAL...

HATS OFF to ya brother.. nice .. very nice.. :)

[Shallow Hal]

ta knowmie, yet again this the results u can get from flowering ur clones straight off . the nycd seems to be a very large producer , i am also trying out a new strain of me called "pot of gold " most indica ( hindu kush X skunk1) i am told iy is a very hight yielder give a massive 600 grams per sqr meter . i'll keep u posted. i have found flowering clones straight off allows the plant to produce nice main colas and also allowing the lower buds to fatten up too.
any thx for all ur kind comments
KEEPING IT GREEN!!!!!!!
Hal

[masterjointsmith]

"...Sunlight is the main source of energy near the surface of Earth. The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. The solar constant is equal to approximately 1,370 watts per square meter of area at a distance of one AU from the Sun (that is, on or near Earth). Sunlight on the surface of Earth is attenuated by the Earth's atmosphere so that less power arrives at the surfaceâ??closer to 1,000 watts per directly exposed square meter in clear conditions when the Sun is near the zenith This energy can be harnessed via a variety of natural and synthetic processesâ??photosynthesis by plants captures the energy of sunlight and converts it to chemical form (oxygen and reduced carbon compounds)... "

excerpt from

* Author: Wikipedia contributors
* Publisher: Wikipedia, The Free Encyclopedia.
* Date of last revision: 23 December 2006 23:07 UTC
* Date retrieved: 26 December 2006 12:01 UTC
* Permanent link: http://en.wikipedia.org/w/index.php?title=Sun&oldid=96178742
* Page Version ID: 96178742

[TheGreenFog]

Ok, well, let me do the math...*thinking out loud*



Based on MASTERJOINTSMITH's Wikipedia finding...

The sun, on a clear day (best conditions), can produce 1000 watts per square meter (3' x 3' = 9 sqft)

That is 1000 watts / 9 square feet = 111.11 watts per sqft



Shallow Hal said 1200 w in a 4' x 4' area (16sqft).

1200w / 16 sqft = exactly 75 watts per sqft




Now, SCIENTIXT, how big is your cab? You said 4.5 feet...but what does that mean? Certainly that is not your square footage...? From the picture, guesstimating from the size of the hood...it looks like you have about 2 ft by...well, 2 ft...wow, I guess it is your square footage...! OK!


Well, then in that case...


1000 watts / 4.5 sqft = 222.22 watts per sqft


TWICE THE INTENSITY OF THE SUN...! :eek:

That's a lot of light...don't bleach them. Beware...

Temps and humidity are a given...must be controlled...

BUT, looks like this is a prime candidate for TOP BLEACHING!


Good Luck, SCIENTIXT! I hope you just get MASSIVE buds with no ill side-effects.

Be cool.

:rastasmoke:

The Fog

[SCIENTIXT]

Damn! I think I need to build a bigger cabinet. I have the space so that is not an issue. I also have CO2 capabilities but I don't have it hooked up yet. I will keep an eye on them to see if they have started to show signs of stress. DAMN!!!! I guess this weekend isn't too far away to build another cabinet. I will keep posting.

HAPPY GROWING!!!!!!!!!!!!!!!!!!:)

[SCIENTIXT]

I just checked them and they look like they are going to pull through. One of them is going to end up shit canned. Yes there are four there. One of them is so small you can't see it. These were from seed. I had them in soil and I just transplanted to this aero system. They are on day three of transplant, day 16 from day planted. I know they look weak but the temp is at 79 still and they did show surprising growth from just yesterday. The pic with mylar in the cab is from the first day of transplant and first day of 1000w light. I had to take the mylar down to keep the temp down and to keep hot spots from burning the leaves. Too bad I didn't know this until after the girls got burned. As soon as I am able to get clones I will start flowering!!!!:D

Happy Growing!!!!!!!!!!!!!:)

[smokin dope]

well after 3 weeks of flouresant, i have my 3 ladies under a 1000 watt hps, on 18/6. so i will tell you if its overkill or FANTASTIC!!!

[Garden Knowm]

YES HAL.... keep me posted.. I also hang out at www.rollitup.org

cheers