There are no TIR optics for H1. Host not comparable with any known TIR. MPCB have no screws so you have to press it properly. I dont know how Simon installing TIR. Probably pressing with fat silicon gasket. This is a disappointing design flaw… “Skilhunt” 17mm TIR is too short. You have to use 2 layers of MPCBs to rise led.
Me too and end it up by creating new driver. It took years and it was no so budget.