Company YKsuccess has a 800watt 48volt hub motor, controller, and tire with tube for $340 some dollars. That includes air mail from china. It took ab amazing four days to get here. It's perfect! I bought another battery from Xtreme ( just the batteries ) and mounted them under the seat. It's a tight fit but they fit. Then I solders a plug from the pwr supply of an old computer (they're the same as on the battery) onto the new batteries so I can use the same charger, and useing the female pwr cord from that old PC, I wired the old battery to the new battery in parallel so as to keep the 48 v but increase my amps to a 40 amp nominal rating. My 700Li goes almost 30mph even up 8 to 10 % grades. It's wonderful. I can still take out both battery packs and charge them or leave them in and charge them.
Now for the head lights. I used luxeon rebel stars. They are 500 lumens each, they were bought from ledsupply.com. I also bought the small sq heatsinks for them the have self adhesive thermal tape on them so the rebels just stick right to them. I also bought from thunderstorm.Com a 48v to 12 v converter to use. Now what I did was to cut the existing white bulb mounting brkt in hal. And mount the rebel stars right inside of it. They fit perfectly , I couldn't believe it , then just twist mount them back into place, wire them to the converter that was wired to the old lights ( I connected both hot wires for low and high beams together ) and use the gnd wire from only one buld. DON'T LOOK INTO THESE BULBS!! they are killer bright.
Ill try to attach pics soon.