Ive used Lumenok's in the past and never had a problem, but the Nockturnal's are cheaper and ive herd nothing but good thing's so im going to try out the Nockturnal's this time.
Let me know how you like them. I like how light they are. I've been using Easton Tracers and they work great. I like that they have 90 hour battery life, and no physical switch.