I love these mods with cheapo hosts with expensive goodies in them 
Which brings me to this headlamp project. A real cheapo 3xAAA headlamp I’ve modded with a MT-G2, two Nichia 219Cs and a 2 x 18650 battery pack modded for 2S:
Mod/build thread here: Mod/build: MT-G2 & dual Nichia 219C headlamp