I want to have the option to mount a light on my 15-Sport with MOE hand guards. I want to install the Magpul MOE Scout Mount.

RAILS & ACCESSORIES - MOE® Scout Mount

The mount comes in a right, ejection port side 1 O'clock and a left hand side 11 O'clock variant.

Question: On which side do you mount a light? Strong hand side or weak-hand side? I'm right handed.

I've always gone with mounting it on the right, opposite of weak hand forward.
Look at how you normaly hold the rifle, which way will keep the light free of interference from body parts?
ETA: I run a Surefire M500 on my go to M4 which has the light at about the 2 O'Clock position which for me is ideal.

__________________
Hold my beer and watch this!

I like 11:00 for a push button/momentary on like this Polytac.

__________________
CLEAR!

JaPes, I shoot pistol left handed and my rifle right handed.(short circuit in my brain). I have the same handguard as you. I use a TRL-1 light which I mount at the 1:00 oclock position. When I train and have to go around a corner to my left, I just cant the rifle so the light is straight up. Hope this helps you.