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Amazon Shop for: Grow Light, Paul Stamets

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Offlineazcrash
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Registered: 06/13/04
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stumped on grow lights
    #3065789 - 08/29/04 06:12 PM (12 years, 5 months ago)

Im going to be growing gormet mushrooms, and I am trying to get the lighting set up.

For the strain of oysters that I plan on growing, the best enviroment is 1500 lux. I have a 80 SQ FT growroom. Can anyone tell me a formula or anything to calculate how many lumens I need for the room?

I found some good grow lights at home depot, two 4 foot fluorescent each rated at 2325 lumens so 4650 total. I installed them and it looks very bright in the room. But I found a formula on the internet and once I calculated it, it stated that I would need about 20 more lights to get to the point I needed. There is no way that I need that many, especially with how bright the ones that are in there are. I would go blind lol.

Anyway, if anyone could help I would appreciate it. Im stumped. Im also going to put this in the advanced mushroom area.


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Offlineragadinks
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Re: stumped on grow lights [Re: azcrash]
    #3065835 - 08/29/04 06:28 PM (12 years, 5 months ago)

I do not know anything about how you did that calculation.
But if I were you I would take a normal camera and measure the amount of light with it's exposure meter.
On this web page is a list for the conversion from time/aperture/ASA to lux.


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Offlineazcrash
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Re: stumped on grow lights [Re: ragadinks]
    #3065893 - 08/29/04 06:47 PM (12 years, 5 months ago)

well I have a good digital camera, but ive never seen an exposure meter in its options. would it be under something else?


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Offlineragadinks
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Re: stumped on grow lights [Re: azcrash]
    #3065990 - 08/29/04 07:15 PM (12 years, 5 months ago)

Do not know very much about digital cameras, but almost any newer camera has an exposure meter.
But I guess the cheaper cameras hide it from the photographer so that he has no influence on the exposure.

I know that the Canon EOS 300d has one like any normal SLR camera.

On this picture of the canon website you can see the ISO speed, Shutter speed and the Aperture on the LCD display of one of their digital cameras.


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InvisibleYidakiMan
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Re: stumped on grow lights [Re: azcrash]
    #3066672 - 08/29/04 10:18 PM (12 years, 5 months ago)

Lux is equivilent to lumens per square meter. Thus 1500 lux would be 1500 lumens in a space 1.0 sq meters.

Your space is 7.43 square meters.
L = lumens
1500=L/7.43sqmeter
10950 lumens=L


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Offlineragadinks
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Re: stumped on grow lights [Re: YidakiMan]
    #3067769 - 08/30/04 03:21 AM (12 years, 5 months ago)

I am not sure about this, but does the amount of light on a surface not depend on the distance from the light source ?
So if the lamps had 10950 lumens the lux on the mushrooms would decrease very much when the distance from the lamps gets greater ?


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OfflineUnenlightenedOne
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Re: stumped on grow lights [Re: YidakiMan]
    #3068180 - 08/30/04 09:00 AM (12 years, 5 months ago)

Quote:

Lux is equivilent to lumens per square meter. Thus 1500 lux would be 1500 lumens in a space 1.0 sq meters.

Your space is 7.43 square meters.
L = lumens
1500=L/7.43sqmeter
10950 lumens=L




This equation is only correc IF the lights are one meter off the floor.Now if its 1.5 meters then you must multiply 10950 lumens by 1.5 and if its two meters high then it must be multiplied by 2.In essence he would need 10,950 lumens PER meter of the height of the lamps/lights from the floor(or lowest mushroom at the least) or else the bottom most mushrooms will receive less than optimal light and at high lamp heights from the floor they may receive virtually no light.


--------------------
Do not desire to reach a high level.Rather work without thought of reward to iron out flaws and impurities in one's self for the sake of one's self.When one has done this one needs not to desire anymore. http://www.lifeforceonlinestore.com/yc/


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OfflineUnenlightenedOne
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Re: stumped on grow lights [Re: ragadinks]
    #3068198 - 08/30/04 09:07 AM (12 years, 5 months ago)

Quote:

I am not sure about this, but does the amount of light on a surface not depend on the distance from the light source ?





Yes.

Quote:

So if the lamps had 10950 lumens the lux on the mushrooms would decrease very much when the distance from the lamps gets greater ?




Yes much less to very little/no light(depending on distance and the lamps lumens) reaches the surface as the distance of the lamp gets farther from the surface/object.


--------------------
Do not desire to reach a high level.Rather work without thought of reward to iron out flaws and impurities in one's self for the sake of one's self.When one has done this one needs not to desire anymore. http://www.lifeforceonlinestore.com/yc/


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InvisibleYidakiMan
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Re: stumped on grow lights [Re: UnenlightenedOne]
    #3068463 - 08/30/04 11:35 AM (12 years, 5 months ago)

Sorry, I do not understand how the distance of the light in meters relates to the dispersion of the light. In other words, how do you figure you can simply multiply by height to account for the light fading.


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Offlineblackmold
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Re: stumped on grow lights [Re: YidakiMan]
    #3069095 - 08/30/04 02:30 PM (12 years, 5 months ago)

#1 Find specs for LAMP lum or lux AND distance FOR lumens reading.

If you dubble the distance say 3 feet to 6 feet of the lamps the coverage airea will incress by 4 but your light lum or lux will be 1/4 that it was at 3 feet

or if you cut the distance in half 3 feet to 1.5 feet your lum or lux
will be 4 times higher but your converage aire will be 1/4 that it was.
sorry about the spelling on lunch

Bill


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Offlineazcrash
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Re: stumped on grow lights [Re: blackmold]
    #3071031 - 08/30/04 10:48 PM (12 years, 5 months ago)

Thanks for all your responses. Basically I will need 4 of the lamps to light the room. The problem I have is that I have 2 lamps in there right now and it almost seems too bright, adding 2 more would be crazy. When Paul Stamets says they need 1500 lux, thats a constant 1500 lux right? Not 125 lux per hour for 12 hours which equals 1500 lux right? Thanks again.


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Invisiblefastfred
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Re: stumped on grow lights [Re: YidakiMan]
    #3085424 - 09/03/04 02:00 AM (12 years, 5 months ago)

Quote:

YidakiMan said:
Sorry, I do not understand how the distance of the light in meters relates to the dispersion of the light. In other words, how do you figure you can simply multiply by height to account for the light fading.




The intensity is proportional to the inverse square of the distance from a point light source. So, no, you can't simply multiply to get a figure.


-FF


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InvisibleMilletV
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Re: stumped on grow lights [Re: azcrash]
    #3092036 - 09/04/04 06:29 PM (12 years, 5 months ago)

Look on the internet for a wholesale lighting company and call them, im sure they could answer your question in a sec.

Or call a hydro shop...........

:wink:


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Offlinejmesar
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Re: stumped on grow lights [Re: ragadinks]
    #13351265 - 10/18/10 09:10 AM (6 years, 4 months ago)
Log in to view attachment

Mushrooms need a certain light condition to flush, Stamets bring some numbers, but how to know without a light meter?
Almost all cameras record a shooting information in each photo (EXIF) that can be read in photoshop (File>File info>Section>Exif): Exposure time, F-Stop,ISO speed, So there are a light reading without a light meter.
look at these files:

Have anyone try this?


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Amazon Shop for: Grow Light, Paul Stamets

Mushrooms, Mycology and Psychedelics >> Gourmet and Medicinal Mushrooms

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