Quote:
Originally posted by KH971
Sanjay, thanks for all of your time and efforts, could you explain what PPFD means ? I am not aware of the meaning?
Thanks Keith
I just recieved my 400 SE XM15k's
love the color but i am awaiting the PAR figures, I doubt they will be good. I also run Icecap elec. ballast.
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Keith:
PPFD - Photosynthetic Photon Flux Density
It is basically the count of number of photons falling on a given area (usually 1 meter square) in one second. It is measured in the units of micromoles/m^2/sec. 1 micromole = 10^17 photons.
PAR - photsynthetically available radiation is technically measured as PPFD, hence used interchangeable with PPFD.
sanjay.