I got an electric bike earlier this year, great fun to ride and makes my journies so much easier, especially up all the hills where I live. Anyway as I didn't have lights for it (they were on my last bike which some pikey stole) I decided to make my own out of the reflectors by embedding high brightness standard sized LEDs, 17 in the front and 4 in the rear, powered off the bike's powerful battery.

As I post this here, the final setup is still a work in progress. I have a temporary setup, the initial prototype but the rain a couple of weeks ago killed some of the LEDs (I've never seen an LED flicker & die like that before) so I need to complete the final (waterproof) setup soon.

It'll be filled with lots of pictures and info (quite a bit there already) and it's a very simple setup that any LumenLab builder could follow. For those of you who don't have an electric bike to power the lights from, it'll easily power off a 6 or 8 cell battery pack for many many hours.
http://www.pedelecs.co.uk/forum/technical/...ight-setup.html

Quite close to finishing it now, yesterday I wired & hooked up the front light as I needed to go out in the dark, this is what it looks like in the daytime...

pretty cool, that seems to be putting out alot of light

To avoid paying $100+ dollars for a planet bike (or like brand) high output LED light (or less for a halogen with a heavy battery pack) I just rigged a maglite LCD to the top tube with some extra rubbed tie-ons from my fenders. Works great. A little bulkier than a dedicated headlight but it runs slimline along the frame.

OR you could add a 12V halogen bulb, and some D-cells in the bike frame, below the saddle.
-then drivers will think you are a car approaching.
And you will have enough light to illuminate the street, road.