Saw you post - I have a BW250, but the light is probably the same. As my seat bucket is out and on the bench, I took the light pigtail down to the auto parts store. Looks like Sylvania 24LL is the correct lamp. 3.4 watts. Six bucks for the pkg of two.
While we are in that part of the scoot, do you know if the seat from the 150 is the same as the 250? My 250 has the uncomfortable seat w/o the slight "scoop" in the butt area. I can source a 150 seat to replace, but need to know if it would fit. I don't believe that the body size is different between the two, but it looks like the met-in box is different. Still think the 150 seat will fit.