Light; marijuana; and lumens

strictly seedleSs said:

I get what your saying, but Im not sure on a number, like lumen/watts per sq ft or what.

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Ok figure.. I have (for whenever i need to flower) I have 4 23w 2700K Lights (CFL lights) for
my flowering cycles. Well, the total lumen
output i have for my plants for flowering..
are those 4 cfl bulbs which comes out to
be exactly 6400 lumens total. at 1600 lumens
per bulb.

I am just wondering if 6400k worth of cfl lighting will be enough to flower a plant.

I am asking because I haven't been using CFL Lighting all that long. Use to use only my HPS/MH bulbs. But got to where I got behind on my electric bill.. so I switched to low wattage CFL bulbs ya dig?

masterd said:

like i said guys, im pretty sure from my research into mushroom fruiting and actual plant growth the proper measurement is a micro einstein, lumens/lux/foot candle mean the light measured in the green and yellow spectrums, so yeah, lumens mean nothing, and sorry for everyone stealing ur thread dude, plants will go into flower as long as the photo period is right and as long as there a difference between the day/night,

They use lumens to measure light because it is a simple and cheap test and you can compare all lights with this, i think they really should be changed for grow lights because it really doesnt mean all that much, someone without alot of knowledge can be quite confused and buy the wrong product, anyway again, sorry for jacking ur thread dude


EDIT: if anyone wants info on micro einstiens or photosynthetically active radiation (PAR) i just found this
http://home.comcast.net/~cerny/pub/einsteins.html

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Appreciate it.. I know what you mean as well. I have read so many different things about growing.. its like its all mixed up like loose puzzle pieces floating around in my head ya dig? So yea, It doesn't matter (lumens) do not matter when flowering then... which I kinda new in the back of my head. Because I have grown and budded a total of 2 plants.

But that was when I was using my MH/HPS lights. Can't afford the electric bill running those lights.. so I switched to CFL lights.

Just wanted to make sure there was not a minimum of lights or lumens I would need to make sure the plant will flower properly. I know I won't get as much yeild using CFL bulbs.. but I have seen some pretty nice grows of people using these cfl lights. So i though eh might give it a shot ya dig?

k well thanks everyone..
peace.

4 23w bulbs would flower the plant, you just wont get that much off it.

ganjaluvr said:

Ok figure.. I have (for whenever i need to flower) I have 4 23w 2700K Lights (CFL lights) for
my flowering cycles. Well, the total lumen
output i have for my plants for flowering..
are those 4 cfl bulbs which comes out to
be exactly 6400 lumens total. at 1600 lumens
per bulb.

I am just wondering if 6400k worth of cfl lighting will be enough to flower a plant.

I am asking because I haven't been using CFL Lighting all that long. Use to use only my HPS/MH bulbs. But got to where I got behind on my electric bill.. so I switched to low wattage CFL bulbs ya dig?

Click to expand...

ok dude, dont quite get ya on he 6400K of lighting? kelvin the the color.... do you mean lumens?, and yeah that should be alright to grow with, the rule with CFLs just keep adding more and more, and different spectrums 2, as far as ur 4 globes adding to 6400 that doesnt work, you cant add lumens, as it is light intensity. sorry, not trying to break ur balls

masterd said:

you cant add lumens, as it is light intensity. sorry, not trying to break ur balls

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Yes you can add lumens!!! Lumens are a measure of photons, put two lights next to each other, and they both spit out photons onto the same area, resulting in added brightness/lux/luminosity.

lmao, are you serious, lumens and photons are far apart, ok dude, here ill show you something, not trying to be a arsehole, but u can NOT add lumens, lux on another hand, yes you can add, alright anyway next post will have a link, cheers bois

alright guys im stuck like a bitch, i cant find it, lumens dont add, lumens are light intensity, and 2 4000 lumen bulbs sitting next to each other still add to 4000 lumens, but it doesnt mean on of these bulbs by it self will be just as good as 2, that is why lumens means absolute jack shit,........... if anyone can find the post with the 2 CFLs and the Light Meter, please post a link here, anyway, please dont take this info for granted, for find it for yourself, show your mates up that think they have a 30,000 lumen set up, when infact it is only a 3,000 lumen setup with 10 globes, but their 3,000 lumen set up with 10 globes kicks arse over your 4000 lumen set up with 2 globes of 4000 lumens(true) youll know why, you really do have more lumens, but you dont have the spread or the capacity to produce the same........ also you dont have the POW-A or the AUTH-ORITAH.....

dude...so...wrong...

Lux = Lumens per sq meter.
Footcandle = Lumens per square foot.
Grab one light, get a light meter, read result. Add second light, read new result.

Better yet, read this thread https://www.rollitup.org/indoor-growing/83128-lumens-lux-adding-all-up.html

strictly seedleSs said:

4 23w bulbs would flower the plant, you just wont get that much off it.

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That all depends, really. I've got a plant flowering under 4 23W CFLS and a 52W T5 and the buds are so DENSE it's unbelievable. I grew this plant using the same CFLs and T5 and kept the internodes close as a mofo (not letting the plant stretch at all).

I've heard people say that CFL buds aren't as dense as HPS or MH buds, but that's certainly not the case with mine. Seems to me if you keep the lights close enough and don't allow stretching, you'll end up with dense buds no matter what kind of bulbs you use.

what are the dimensions of that plant, and did you use any "enhancer" nutes (like gravity/snow storm)? density is great, but wit that much liht you wont get that much bud, and your 4' t5 is like 3 Cfls when it comes to light spread.

gammaz said:

dude...so...wrong...

Lux = Lumens per sq meter.
Footcandle = Lumens per square foot.
Grab one light, get a light meter, read result. Add second light, read new result.

Better yet, read this thread https://www.rollitup.org/indoor-growing/83128-lumens-lux-adding-all-up.html

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lmao, dude i dont know if u know it, but your actually backing me up, those photos are with a lux meter, so yes the number will go up, find a more accurate test with 2 CFLs its on here somewhere......... YOU CANNOT ADD LUMENS, it is as simple as that

masterd said:

lmao, dude i dont know if u know it, but your actually backing me up, those photos are with a lux meter, so yes the number will go up, find a more accurate test with 2 CFLs its on here somewhere......... YOU CANNOT ADD LUMENS, it is as simple as that

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dude...lux meter, measuring lumens per square meter...if you cant extrapolate, I dont know what else to say. Anyway, its ok if you have a different opinion, Im just making sure people get the scientifically accepted opinions as well

yes yes lets devolve into the "lumens don't add" act.

After reading this thread I have no idea what anyone is after...

More watts is more yield plain and simple. More watts, tends to lend to a higher intensity- which means, how much, how many umols of lights, are shooting out of a particular point... the more the better, a la HID.

HIDs are pretty crazy though... and inefficient, oh, and put out too much unusable, unphotosynthesizeable light. which means its wasted electricity and therefore comes back at you in the form of heat.

Lumens don't exactly add, yes, If you have one point of light, putting out so many lumens, adding another point of light proximally of the same intensity will give a higher rating on a meter... but the factor isn't exactly addition. its lower than that, and at a point, adding more points of equally intense radiation won't help the rating rise above that of the individual bulbs...

but more watts burned will help a plant.

As for spectrum specific light sources... I don't think there is anything other than anecdotal observations on the correlation between spectrum/watt and parity to hids... meaning, all red at 100 watts obviously is better than 100 watts of warm flourescent, or HID for that matter, but not many times better. its not magic, cause its not any more intense, its not any more light, umols, einsteins...

So still its the wattage that matters most.

The intensity, the initial lumens, is what really counts, you must hit the plant hard to even try and mimic the sun. and the sun hits fucking hard. again, more watts lends to this. More watts in a smaller package means this.

So in sumation, low intensity, wider points using higher wattages not as good as similar watts in a more effecient, more concentrated package... I'm thinking good leds and hids, although hids can be placed feet away, and leds should be inches away... A testament to the initial lumens and the lower lumens per watt of leds, and they're lower power handling capabilities.

sigh.

this argument is non existent.

my led, uvb cfl grow is successful. I think I will get close to a half pound from like 900 watts... but i really dont know yet. I mean, gram per watt is standard.

You do that kind of growing at about 60 watts per square foot. No matter what source, I think this number is a good guidline to go by to be a standard grower... below this there is no better upgrade for your garden than being able to handle more watts, more intensity, more initial lumens... more PAR, umols or micro einsteins of light.

So, the minimum is 60 watts per foot if you want to be responsible, no matter which package you choose. (thats a 1000 on a 4x4 table, and a 600 on 3x3)

The einstein isn't IUPAC so from now on its uMols of photons.

gammaz said:

dude...lux meter, measuring lumens per square meter...if you cant extrapolate, I dont know what else to say. Anyway, its ok if you have a different opinion, Im just making sure people get the scientifically accepted opinions as well

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as treeth said, they cannot be added mate, so that is not scientifically accepted, its just an assumtion, that makes it easier for people to describe their grow room, because they can say it has 70,000 lumens, when they have 10 7,000 lumen bulbs, but the light intensity has not changed its still exactly the same 7000 lumens although the lux will have changed

yeah,

the only way to really compare is to go by what you put in-

watts,

to what you get out-

yield.