Yesterday I bought a ZL SC5w OP directly from ZebraLight. I also purchased a bunch of wands and diffusers from FastTech for a 25.4 mm head: the silicone diffuser recommended by cyclesport, and also the Nitecore NTW25 (traffic wand), NDF25 (cone diffuser), and NFD25, NFR25, NFB25, and NFG25...