Hello paul gv250,
TECHNICALLY, considering the design (shunt type) of our regulator/rectifier, our charging system is always at full load, and any power not used is shunted or shorted from the reg/rec to ground. Replacing the headlight doesn't really save any of those parts any grief. Bigger gauge wiring or a even a MOSFET style reg/rec is more beneficial to electrical health, but is challenging depending on your electrical skills/ amount of effort you wish to put in.
That being said, if your goal is to get a brighter headlight, lower the total power draw of the bike (more headway to add other things like extra lights, 12v sockets, gauges, etc), or to just have an LED or HID light for looks, then you would be looking at an H4 style bulb, with some sort of high beam /low beam capability otherwise you'll lose functionality of one or the other, and probably piss everyone off in the opposite lane. The first choice is poor for this very reason, but the second choice seems appropriate. I don't know the validity of the company that choice, nor can I help you with pricing since your currency doesn't match my own. Good luck regardless.
