There are 3 generations of T6 lights. The first, up to 2004, uses a 108-1376 bulb without a built-in reflector. Mid 2004 - mid 2009 needs a 108-1377 (reflector, gold contact springs). Late 2009-up uses this one (108-1382) with silver contact springs. Be sure to order the one that fits you light. Currently, Optics Planet only seems to stock the latest model. The earlier ones are very hard to come by, having been apparently discontinued by the mfg.
Pros: Excellent price for T6 light 2009 and later
Cons: won't fit models made before 2009
This review was written in the old system and had content requirements that are different than reviews written today.