You need higher temps. I run 84-86 @60% humidity. Clear through. Start to chop. If I drop below 77° they get all droopy. Atleast in my experience. But you def need to be above 80° with strips.
I showed how to calculate PPFD from the PPF numbers in my first post. Not going to make a difference the further the light sensor is from the LED the lower the PPF readings then doing the math to calculate PPFD will show it gets weaker the higher the light.
PPF is a constant as @sethimus stated - it is a measure of the total amount of PAR - not weighed by a distance variable. Your sentiments undermine the very unit of measure.
ppf is the total output of a lamp. ppfd is the total output of the lamp over an area. why is that so hard to understand? ppf can only be measured in an ulbricht's sphere. now go weep in a corner, loser