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I have two 24/7 finnex one on each 40 gallon tank and have always run them at max. I am switching to 24/7 mode to see the difference.assuming I am running the lights from 11:30 to 7:00 pm will there be a large difference in par for the plants...
 

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Yes, obviously with max you get the highest par the whole time while 24/7 only has a max for short period of time. Here's chart of it = http://www.plantedtank.net/forums/7839081-post209.html
Close to 1/3rd to 1/2 (high est) the PAR of full on for a 9hr photoperiod..
since you run 8hr's full closer to 1/3 the PAR.Rough guesstimates from the graph..and ignoring "moonlight"..
so really 2/3rds of your current PAR output..
 
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