From one of my friends on another board.

hese PAR reading were taken with all powerheads/return pump off with Apogee mq-200 meter. Lights 8" above water.
[Blue/white @100%][under waterline 1100][5"845][10"565][15"370][20"195][25"140][Blue/white@50/50][under waterline 480[5"330][10"240][15"145][20"90][25"35][Blue/white@60/40][under waterline 465][5"290][10"220][15"155][20"100][25"62]

Found this info online for the galaxy hydro 165w black boxes hope it helps someone else in the future :-)


http://www.reef2reef.com/threads/led.../#post-2887090

A bit on these, the spectrum isnt great great, but it makes for up it in intensity.
an fyi above 450 par most corals shut down photsynthesis anyway.(dana Riddle)

So yea, it's a pretty good gateway drug to Radions and AI's.(the Hard stuff)