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Originally Posted by knna As reference, u will need from 150 to 300 PUR in veg state per m2. Average 200-250. With 3 18w tubes, u get 9,431 *3=28,29PUR.
28,29/200=0,14m2 (1 1/2 sq ft) is the grow space allowed for that light (using decent reflectors). |
Gee, thanks Knna!
I already had downloaded your excel file from which i couldn't understand anything but now i think i get it.
So to sumarise if possible,
a. You need to cover the most possible spectrum of light needed by your plant to veg
b. You need an average of 200-250 PUR/m2 for ... intensity(?)
Off with lumens/wattage ?
I think this thread is breaking this down quite well...
btw by googling i find the aquarium scene about 10 times more informative on lighting data, these people are way ahead.
Lighting theory explained (it's focused on corals but gives a nice tutorial on the basics)