I finally got the parts from Cutter to complete the conversion of my two old Lumi halogens, and get some beam shots together for a comparison with my Lumi LED3.
LED3 (wide angle) on full power:
Converted triple XPG, medium optic, 670mA driver full power:
Converted triple XPG, medium optic, 670mA driver “half” power using 150k pull-down resistor:
Converted triple XPG, spot optic, 670mA driver full power:
Converted triple XPG, spot optic, 670mA driver “half” power using 200k pull-down resistor:
As you can see, there’s nothing to choose between the LED3 and the wider angle converted XPG.
Both converted lights have a 3-way switch for off/full power/half power. Although a 200k resistor on Black Cat’s driver should give half power, it felt brighter than this, so I switched to using a 150k resistor on the second light which dims it more convincingly.