TWs need to keep their electrical systems balanced to avoid over- or under-charging the battery. Add 1 amp here, need to take away 1 amp there, or over time, you'll end up burning out the rectifier or worse. Simply replace all the other lights with LEDs, and you'll be really close. Your light bulb replacements will be practically eliminated. Get the brightest LED replacements you can fit so intensity is retained--some of the cheaper options are simply too dim to be safe. The exception would be the indicator lights--get the single LED as the brighter options are simply blinding at night.
I've run twin 35W HID conversion H4 headlights and LEDs everywhere else with good results. Lost that set-up to a chunk of firewood tossed up by a semi's duals. Switched to the stock headlight with a 55W HID conversion. Light was excellent for offroad--like a giant floodlight, but no pattern on low beam to prevent blinding oncoming drivers. Ran a SilverStar Ultra for a while, much better than stock. I've rebuilt the dual headlight system for Tdub2 and ditched the HID conversions for a pair of J. W. Speaker 8800 LEDs. Works for me.
EDIT: I know LEDs will be too expensive for most folks, but these are DOT approved and legal in Canada. HID conversions are neither DOT approved nor legal in Canada.
