Ah yes one of those!!
I did put in higher wattage bulbs in my B3200. Went from 35 to 50 watt with no ill effects. Not sure what your lights are like. You might have a time finding lights to fit those sockets.
The only place I was able to locate a similar bulb with that goofy flange, was on ebay with a site in England and they sell bulbs for Motorcycles.
I went ahead and ordered two 35/35 watt bulbs and I can try them and keep checking the temperature when I install them to see if the plastic lens gets any hotter than with the oem 15/15 watt bulb.
I have always been disappointed by the light output of the headlights on the B2150.
In addition to ordering these 35/35 bulsb, I just completed an alternator upgrade ( to 40 AMP ) and have some LED worklights to install.
I need to light almost exclusively for nighttime snow blowing with my rear blower, but if I have better li[ght, I may be incluined to finish cuttint grass in the summer even after it gets dark.
It's been a real challange to do anything in the dark with the stock lights.
Thanks, Tim