needing help by a lighting master

People think that LUX and lumens are the same, nlsk1 could just explain it without being a twat.

Japanfreak said:

People think that LUX and lumens are the same, nlsk1 could just explain it without being a twat.

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I am not sure I am experienced enough to explain it for you... I probably need references or something...


Ok, now I am being a dick...


Here is the deal. Lumens do not add up. If you have 2 small light sources next to each other you can get more LUX which means lumens hitting from multiple sources.

The fundamental problem with this argument is the distance from the light sources to the object in question. When you are dealing with small light sources (small wattage) the square to the distance is much more critical than if you are dealing with large light sources (1000W).

What some people want to try to argue is that if they pack enough low wattage lighting into a small area it will equal the amount of lumens as professional lighting. They swear to god that if they just add another 2 - 26W bulbs and a splitter that they are going to yield the equivalent of a 1000W grow. It is simply not true. Now, if you want to try to grow 1-5 plants under CFL's you can achieve fair results. Someone very experienced might be able to achieve good results. But the light coverage of a 1000W bulb starting at 150,000 LUMENS just wins hands down. By the time you are getting decent results from CFL's you have enough wattage to get a decent HPS light.

Now, there are plenty of reasons to use CFL's for vegging, germinating, and in some limited circumstances blooming. And if you have a PC grow or heat issues, etc then it is perfectly fine to use them.

And NONE of this addresses the question of the original poster. His setup is just fine for where he is at.

MedHeadGRWR said:

Took this from the original post on that thread

"What this means is that if you put two lights the same distance from a point, and each light provides N photons per unit area at the point, with two lights you will have 2N photons per unit area at the point. Because intensity is a measure of the number of photons per unit area, the light is twice as intense, whatever unit you choose to use. Twice the lumens, twice the lux, twice the footcandles.

An obvious practical caveat to this point comes when using multiple low-intensity light sources. Notice how I stated that the lights were at the same distance? A practical problem with CFLs, for example, is that while you can get 27000 lumens from 10 x 42W CFLs

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Yeah, you sorta cut that line off short eh?

it's difficult to get them close enough to make them useful.

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Look, I am going to unsubscribe from this thread. As I said, I am not interested in arguing about lumens.

Peace

http://www.bikeforums.net/archive/index.php/t-361623.htm
i just came across this thread on a bike site about the same topic, and although its not about grow lights, i think it can still be applied to this topic as well..
i had always heard that lumens do not add up like nlxsk was saying, but after reading that thread, now i have no clue as to whom is correct..

NLXSK1 said:

I am not sure I am experienced enough to explain it for you

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Well I already know. Now why don't you amaze the kids with your wiki powers because they might not be able to see what you really are.

Japanfreak said:

Well I already know. Now why don't you amaze the kids with your wiki powers because they might not be able to see what you really are.

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what did i miss, is he really macully caulkin , murdered spellin i know