Finally, few pictures of the build.
The plastic case contains the main circuitry, based on Pilom 9. It has 2 switch : 1 general, and one to choose slow/fast mode (see pilom).
The light itself is made of a convoy s21a host. Inside, is a triple nichia 219c 4000K, with a carclo 10510 (20 mm triple elliptical)