I recently posted a review of the Nightstick TCM-550XL weapon light. In the review, I talked about how this compact light has tremendous potential for the EDC market but I lamented a lack of holster support. That is a major hurdle for any new weapon light to overcome.
Fortunately, holster availability is already improving thanks to Black Rhino Concealment. Their TCS-L Holster is now available for the TCM-550XL. The TCS-L is a convertible holster that can be configured for IWB or OWB carry.