The only thing in SP33 V2 that caused some confusion to some customers was the UI of the boost driver. The lower the voltage was, the less brightness modes you could trigger.

SP70 however does not boost its voltage from a single battery but simply uses two batteries in series (= 2x 3.7V) to drive the 6V XHP70.2. For those of you who are skilled in driver modifications, you may want to try Convoy's FX-31 (L6) 2S/3S buckdriver in the SP70. You will probably gain more runtime and efficiency but less maximum output. I suggested Sofirn to have a look at Getian's FC40 LED that I discovered on Simon Mao's Convoy thread. They seemed very interested but first attempts to source this special neutralwhite HighCRI version were not successful. Maybe in some time they can also get access to those emitters.

XHP50.2 3V was chosen because - IIRC - it was cheaper to source and more powerful (3,500 over 2,500 lemons). Last time I talked to Barry I heard it was difficult for Sofirn to get any XHP50.2 LEDs and so multiple flashlights suffered significant delays (SD01 Pro, Q8 Pro). Q8 Pro was meant to be using 3V XHP50.2 LEDs, i.e. same driver design they used for Q8.