ORIGINAL: gibblet
it won't produce as much momentum only because the arrow is lighter.
No it won't that is why the light arrow will lose more speed when shot from the same bow but it won't lose as much when shot from your bow as it does when shot from his bow and then compared to your bow with a heavy arrow.
You must compare apples to apples,shoota light arrow from your bow and you will see there isn't nearly as much difference in the 2 arrowswhen shot from the same bow.Especially at 23 yards.