If you're asking whether your eyes can substitute for a PAR meter, absolutely not.
The question I always have with PAR meters is that of spectrum. We know that light intensity varies over spectrum and different frequencies matter for corals but a PAR meter lumps everything down to one number. How do you compare equal PAR numbers with different spectra?
The question I always have with PAR meters is that of spectrum. We know that light intensity varies over spectrum and different frequencies matter for corals but a PAR meter lumps everything down to one number. How do you compare equal PAR numbers with different spectra?