Max system voltage on '09 or later Husaberg??

Measurements taken with a Fluke multimeter and giving the ol 570 a good bit of throttle.
14.47 Volts with no accessories turned on.
14.38 Volts with High Beam Switched on.

How's the new job Codemonkey?

I reckon you would be sweet with a 14V LED running on 14.47. It's only a .47V out which is bugga all, and you would drop a little bit of voltage in the cable run up to the Headlight at a guess. I know LEDS don't draw much current and so the cables don't drop much voltage, but I would go with it.

You could allways install a resistor in series with the LED if you were real fussy. Measure the current is draws when connected, then use the formula Resistor Ohms = Volts divided by Amps.

Example if the LED at 14.47 Volts drew 0.5Amps use the closest resistor you can find to .94 Ohms (R = 0.47V divided by 0.5Amps). 0.47 Volts because that is what you want to drop accross the resistor.

The LED might not draw the same current when you install the resistor but it would be pretty close.

Wattage resistor required would be Amps Multiplied by Volts, example 0.47V x 0.5Amps = 0.235Watts. So closest wattage up or any higher wattage resistor is the go. In the example it would be 1/4Watt

All modern bikes should produce right about 14.4 volts plus or minus. This is what a battery needs to properly charge. Any less would lead to shortened battery life. Basicaly if a light is meant for any automotive or motorcycle applicaton, it will handle 14.4 volts.