You can also buy the Optronics fog lights from JCWhitney. Buy the round ones and ignore that it says it uses an H-3 bulb. I personally bought this light from them and put a Phillips energy saver 20W MR-16 spot in one and 20W flood in the other (I wish I would have put 20W spots in both). I have both mounted on my bike using the spot for the most part with the flood as a backup in case the spot burns out while I am on the road at night. I do like running both though. It makes a very nice light. My battery sources are a 6ah and 7ah SLA battery which will run the single light over 3 hours and both about half of that. I have two batteries, but only carry one. The other is a spare.
http://www.jcwhitney.com/autoparts/I...D:100000201440
I prefer using the Optronics because it requires very little work. The only modification I made was installing a mini toggle switch from Radio Shack on each lamp housing. I then replaced the 50W fog lamps with the 20W Phillips Energy savers. I use the Phillips bulb because they put out 35W of light, but use only 20W of power. These bulbs are expensive ($10.99 ea.) but far superior to the standard 20W MR16 halogen bulb.
I now have another battery that I read about at the beginning of this thread. It is the Vector Pocket Power 6ah battery. I found one on ebay for about $22 shipped. It comes in a weather resistant case and comes with a charger. It has a cigarette lighter connection, so I installed a cigarette lighter plug on my bike wiring harness. Very easy to plug in now.
This is my second attempt at making my own bike light and my recommendation for others wanting to make their own and not wanting to put alot of effort into it. My first lamp was made using the Malibu ($15 ea.) landscaping lamp, but the bulb would vibrate out of the socket. I spent alot trying to make it work and was never happy with it. These Optronics lamps are made for cars, so they are designed for the vibration. I like the looks better as well.
Bill of Materials:
Two Optronics fog lights $22 shipped
Two mini switches $6
Two conduit clamps (light mounting brackets) $2
Two bulbs $28 shipped
Wiring harness $5
Cigarette lighter plug $5
SLA battery $22 shipped
R&D $200. Just kidding. Probably about $100. lol
Total for two bike lights, wiring harness, battery and charger $90
May be able to do this more inexpensively if you can find parts locally and not pay shipping. Another savings is using cheaper bulbs, but your light output will not be as bright. Another savings is not trying to reinvent the wheel yourself. Learn from people on this thread. If someone is having a problem with a particular type of setup, most likely you will too.
I would also like to mention that I just installed a tinted Mueller Windwrap on my Sun EZ Sport. This light setup shines through the fairing just fine and lights the road very well. It does light up the fairing as well, but even that makes it easy to read my computer. Also makes it easier for cars to see me from the side.