Wow, Paulo, is your last name Mandelbrot? Though he IS a fan of the seahorses, I was looking for a far simpler answer. Maybe I overstated the question...

Would the energy that hits a target coral be equivalent if it were the lesser PAR for a longer time as a greater PAR for a shorter photo period?

My example was 300 x 4. And 200 x 6

With both equalling 1200 "PAR-Hours".

I am assuming ALL other things being equal.