DonJones said:
Please explain how plants see the bright moonlight differently from the way we see if they both cover the same spectrum. Now I'm not trying to argue, just trying to understand what seem to be contradictory to the laws of physics.
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Sorry haven't been around much..busy time of year for me.
Tryer answered your second question for me on releasing of personal info
To answer your question...
Apparent visual magnitudes of known celestial objects
–26.73=the Sun
–12.6=Full moon
or in Lux
0.27 lux-1 lux Full Moon on a clear night
100 lux is a dark overcast day
10,000–25,000 lux is daylight not receiving full sun
32,000–130,000 lux is full noon day sun blasting right on ya
Just becuase it "appears" to be bright to us, doesn't mean its usable for photosynthesis. Full spectrum light is pure white. Presence of all wavelengths, Black is the absence of all wavelengths.
Our eyes interpret reflected light..thus why green plants look green. They absorbed the other light. All light is to us is seeing what the object reflected back. So a full moon is missing all the factors that plants need for photosynthesis
Mom nature sure does have her groove goin on.
Visible light don't mean much to plants..its the PAR, lumens are more for the amount, but spectrum is where its all at. Providing the wavelengths that the plants use and as much intensity as possible. Photosynthetically Active Radiation is what matters.
If your going to use a light meter, One that measured the wavelegth of the light provided would be the one to use.
hXXp://www.specmeters.com/Light_Meters/
I don't see much use in buying one, but where i would see the benefit of a light meter is to keep track of life expectancy of the bulb, check for light leaks, and checking the grow bulb wavelengths to maximize growth.