I've been using Lumenoks for about 3 or 4 years and have never had any trouble. They do add a few grains to the mix but not enough to matter and not as much as putting a wrap on your arrow. I do have to warn you though, once you used them then you'll be hooked and will want to use them from there on out. Click on the Lumenok banner and watch the video over there. Pretty interesting stuff