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All of those replacement MR16 LED bulbs are intended to go into indoor fixtures that are ventilated. They may overheat in a sealed fixture like those driving lights.Maybe. Maybe not.You can get a set of 10 watt LED driving lights for around $30. I'm not sure it is worth the effort to play with a replacement bulb only in a fixture not made for LEDs.
AF -- we might be over-engineering this LED replacement. I think if you find an MR16 bulb in Europe that fits (which should be easy) you will be happy with it.
A relay would be tapped into a switched circuit. That side of the relay will turn on/off the power to the aux lights. A relay uses a very small amount of power to pull a magnet that switches power through the other side of it. A low voltage side to turn it on and off, and a high voltage side that switches power to your lights. The low voltage side will have a feed wire from a switched source and a second wire to ground. The other side will have a fused wire from the battery coming in, and a wire going out to your aux lights. That way you are not overloading any wiring by adding to a circuit.edit: Your on/off switch would be used to turn on (trigger) the relay, which would cut through the main power feed to your lights.John Henry
I installed the Kuryakyn Silver Bullets on my lower forks in 2008. The design is nearly identical to those purchased by the OP. Originally ran 20W halogens - switched to the generic residential MR16 LED probably 3 years ago. Very similar to this:They work as well or better than the halogens. I use them for visibility, so beam spread isn't a concern for me. If you're trying to improve road illumination you may need to experiment.The clear round gasket in this picture that seals the lens is probably made from a plastic-like material that won't seal well. Add a thin film of clear silicone prior to assembly.Pro tip: after plugging the bulb into the socket, cover the connection in blue RTV. It's easy to disassemble and pick off when the bulb needs changed. Mine have lasted probably 3 years on average.
I’ve installed Denali LED lights from Twisted Throttle in some of my bikes. I ditch the switch and just run them hot from the switched main power. I never seemed to need to turn them off. The amount of light is fantastic, but more importantly, the bike tracks as a motorcycle to others, not a one-eyed car.