Originally Posted by
vincentpaul
2 low-voltage outdoor spotlight fixtures w/ 20W halogen bulbs: $24 (Home Depot)
12-volt 6-amp motorcycle battery $35 (auto supply store)
in-line 12V fuse holder and box of assorted fuses $3 (auto supply)
1 55 W outdoor halogen spot bulb to substitute for one of the 20 watt bulbs
dual dc switch and miniature case $5 (Radio Shack)
spare 2-wire extension cord $free (garage)
misc zip ties and bungee cording $free (garage)
$70 total
Strap the battery to the back rack. Strap the lights to the handle bar. Run wiring from lights to switch box and then to battery. I run with 20W most of the time. When all 75W are running, it lights up the street like an airport runway. You can see signs five blocks away. Plus
I'd agree with everything but the fuse and the battery. Never needed a fuse on any of my bike lights and for $35 you can do better...and lighter...for the battery. SLAs aren't nearly rugged enough for the amp draw of halogen in cold weather. Better to go with NiMH in an RC car battery and wire two packs together in series. It'll give you a whole lot more light too.