I think an L4 would have had to have been used differently, instead of putting it on the stage ceiling I would have shined it in the direction of the people. Being it is more of a flood it would have been used differently. As to the 15 lumens it is noticable, however I don't think it is really a hindrance.

I think the best thing for you to do is go to your local Surefire dealer and play a round with a few different lights to see what you like.