I've shot everything from 425 grain target arrows to 725 grain stump busters from my 50 lb sinew backed osage bow. The light arrows were my mindless pursuit of more arrow speed at any cost. The costs included bad form, loose fillings in my teeth, uncontrolled bladder, and a bad flinch due to the handshock.
On the other hand, the 725 grain arrows weren't really all that terribly much slower and I got incredible groups (they are also 30" long compared to the 26" 425's). But then this bow is built for heavy hunting arrows, some designs like the pyramid bow seem to really shine with light arrows due to less mass at the tips.
Good shooting!