If you have Aqua Signal as running light fixtures, you’ll likely have an Aqua Signal fixture at the masthead as well. They’ll use the same bulb. In mine (1999) for example, the stock bulb is an incandescent 10-watt Bayonet style for both fixtures.Can anyone tell me what 12V bulb is specified for the masthead of the 1996 Oceanis 351? I don't want to have to go up twice.