Thanks - yes I have built LEDs strings, drivers, and resistored light strings in the past - 17 years ago as a hobby.
I just do the calculations by hand - easier for me.
Mostly just lazy and busy right now.
There is a pretty wide voltage swing on 48 volt battery packs, especially the AGM ones going from cold charging conditions to hot / depleted state. Can easily go from 60 to 48 ish or less, plus voltage spikes, so a real driver based solution would be nice.
Watt-a-light sells a similar bulb. I don't buy off of the ali site or similar. There is enough fraud on other on line sites that are considered "relatively safe", but thanks for the look.