.... use an mr16 12v "landscaping" bulb.
There's a thread on here somewhere that discusses it.
This seem like a nice one. I've had two somewhat lesser rated (lumens) wired parallel STRAIGHT to the stator. Dim but stay lit when idle, lights up the road fantastically when running. Been running two summers now non stop. No problems. These MR16 bulbs just seem to love the ragged peaky voltage coming off my ZA50. Internally rectified, choked, smoothed, etc. Have little circuit boards inside. Nice pattern at 35degrees (mine). The above might be better yet at 25d.
I'm know nothing about electronics and lighting. I tried an mr16 on a lark since menards had one on sale for a buck. I was astonished at how well it worked just wired direct. So I got a much better rated pair from Home Depot for six bucks each and wired them parallel. Ran beautifully. Many many hours later, still running like new. Very happy.(edited)