Note - don't be tempted to try using the extension tube and 2x 14500's....
I have never understood this fascination with expensive torches. For me a torch is something I use when there is a powercut. Are there clubs for torch fanatics? I have a vision of a bunch of anoraks in a field flashing their lights.
Extension tube available for an extra £2.50:http://m.gearbest.com/diy-parts-and-tools/pp_195408.html
No extension tube but got the S15 off gearbest for less than £12. May not exactly the same. Oos at mo though: http://m.gearbest.com/led-flashlights/pp_79491.html
But my tourch had 4.8 out of 5 with hundreds of reviews.