If you want to use the 510 PIAA lights, go with a 35 watt bulb. That is what I have on my DL-650. I also have Symtec heaters, and a GPS. With everything running, (PIAA lights on, grip heaters on, GPS recharging, and headlight on "high"), my voltmeter will show 13.8 to 13.9 @ 5,000 rpms. If I drop in speed, the volts will also drop to around 12.8. It is rare that I have everything on "full blast" though. Usually, my voltmeter will show 13.9 to 14.1 under what I consider normal riding conditions for me.
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