Agent86

Hi Grow Bros:

No offense Ironlunga but I had to see for myself.

Here are the test results.

I'm not so sure about the light spectrum thing but I went to the lighting store this afternoon & put a lumen meter to the EVLs.
I keep my plant tops 2 1/2" from the lights so thats the distance we held the light meter. We also used the same reflector I have.
We took the light in the back room where there would be no other lights on.

Right beneath the center of the bulb the reading was 19,000 lumen. we also held the meter beneath the end of the bulb & at the front of the bulb.
At the end the lumens were 19,800 & at the front they were 17,000 lumen.
Conclusion: 1, Regardless of spectrum they still have lots of lumens.
2, Center your plants towards the end of the light not the middle for balanced lighting.
3, The main problem I can see with the EVL would be for the large grower. You have to keep them very close to the plants to get the high lumens. When you move them up to cover a larger grow you lose the lumens. So, a large grower would need alot of EVLs & therefor EVLs wouldn't be very cost effective.

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Xzoomd

Would it be hard to go back and find out where 13000 lm thru to 9000 lm would be in inches from the light. Some 45* angle ones would be useful too. Any of you guys talked to nitrous about hooking An EVL to his homemade China Hat reflectors. Handy dood.........journals...HID grow! May cover a better area....but again, the meter?! Read a vertical hang in an HID indoor is getting results. This light is cool but they need to build one about four feet for $150 per.. I know!! Fnck d'stock market..we as stoners, should buy all the stock in these companies, then politely 'Make' them produce it...so we can corner the lighting market, with an auxin induced side shoot busn in solar panels And how is your lumenosity this evening?

JoseHempSeed

hey agent86,
the 95W envirolite bulbs only put out TOTAL 8,900 lumens.
how on god's green earth can you measure 19,000 lumens???
better get that meter looked at

mist420

Jose, 86 said that they put out 19k lumens 2.5 inches from the plant. The 8900 lumens reading comes from one foot or more from the plant.



mist

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Just for the record, I do not have, have not ever had, and dont plan to have, marijauna growing, or used, in or near my home or any other location familier to me that I may or may not have access to. Any postings I make on any forum's like this one are for purely entertainment purposes. Any pictures that I post have been created by artifcial means from images gathered from, but not limited to, the world wide web. Anything other then this paragraph should not be considered truthful or reality based. -mist420
EVL vs HPS/MH
My Envirolite Grow
EVL Bud Shots
Second EVL Grow, SK#1's

Agent86

Hi Mist

Thanks for bringing Jose Up to Speed.

86.

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regularguy

Hmmm
Very interesting measurements. If you have a light that puts out 8900 lumens at 1 foot, that is the standard distance for a lumen by definition, and something doesnt work out here. Using the equation E=I/(d^2) with I being lumens and d measured in ft and I being the measurement you took at 2 inches we can work the equation using your measurment as E.

Here is what you get.
E=20,000(foot candles)
d=2in/12in/ft=.16667ft

and I= 20,000*(.16667^2)= 555 lumen.

There you go your 90 dollar bulb is a standard CFL bulb provided you used the light meter right. I doubt you screwed that up as 2 different people on this board measured that the same number. Something is not quite right?

HERE IS THE SIMPLE WAY TO DERIVE THE INVERSE SQUARE LAW

Agent86

Hi Regularguy:

You went right over my head with the math.
Using your math what should the lumens be at 2 1/2" based on the lumens being 8900 at 1'.

Later Grow Bros.
86.

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The only difference between a wise man & a fool, is in the magnitude of his mistakes.
While genius knows it has limits, idiocy is always unbounded.

regularguy

It should be really high. Like add a zero to your measurments. What we really need though is to know what kind of light meter you have. If it is for photo i think they show green/yellow light as what is very intense. It is the same reason mist said that they looked so much brighter than his friends MH or HPS( i forget which it was but it was most likely MH). Humans percieve green/yellow light to be 5 to 10 times greater than blue or red light. But now i have to read and think some more as i just thought of something. Can you tell the difference between yellow light plus blue light and just green light? I dont think humans can. I wonder if plants do?
Argh and im all out of weed and all i could get was this dark hash and it makes me have this wierd body high but it turns me into stupid so i hope this all makes sense.

Agent86

Hi Regularguy:

I don't think the light meter was for photography.
I used the meter owned by the lighting store.

When you say really high, like add a zero do you mean the lumen reading should have been like 190,000. I'm still not sure what you mean.

Thanks
86.

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While genius knows it has limits, idiocy is always unbounded.

choader

We are missing a piece of data. I think we have to account for area the light is shining over. Here's why.

IF, the EVL has 8900 lumens at 12", then:

Given E=I/D**2, with E=8900 and d=12", I=1281600

However, looking at the link from regularguy, it talks about the area over which the light shines. So the I number above could be total engery output, which would have to be divided over area.

If I use I=1281600, I get an E of 205056 lumens, which is an order of magnitude off. However, if that is truly energy out and you divide it over a 10" area, it comes out. But I think this is suspect.

Seems to me we are missing something or applying the equation wrongly, but close.

Let me look into this alittle more too. Now where's my Physics book????????????

Thanks.

Choader