You have a lot more options at 12 Volts. If you stay off-road, NAPA sells a LMP4509 that fits perfectly, fires out 110000 candlepower, draws 100 Watts and costs about $10. Life is pretty short (rated 25 hours in an airplane with all that vibration), but I only use mine during snow storms for plowing and the tractor only sees the highway when I push out and turn around. (1966 140 slightly rusty working tractor).
It pretty much requires an alternator and an upgrade to your lighting wiring. I use modern 15A switches with separate fuses for front and back and 12ga. wires I put in when I did the alternator. You could use relays and keep the rotary, but the resistor wire on Dim would have to go.
The stock bulbs are GE 4411, 18watt and 3000 CP, with a very wide spread and cost less than $5. The air lights have a very narrow spread, but put out enough light it doesn't matter. Plus you can see into the next county.
There is also a GE Q4509, which is a quartz-halogen, 140,000 CP, 100w, 100 hours life, but not available at NAPA. It costs $20 to $30. I have not tried it, but I might if the 4509's start to go.
This is not for everybody, but it works for me since 2004.
This post was edited by TheDurk at 11:44:13 12/04/09.
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