Daf work light provlem

On both a CF and LF when using the factory work light wiring, Im getting approx 12 volts on the wire when both the ignition is on, and ignition on and the engine running, with the work light switch off. Light switch on getting full battery voltage. Not a problem with a halogen lamps, but with LEDs a faint glow.
Guessing its to do with the can bus?
Any one know of a cure or fix? I was thinking a resister/ballast used with the lamps?

Thanks in advance.