This plastimo navilight all round white LED one looks interesting;
http://marinestore.co.uk/Merchant2/merchant.mvc?Screen=PROD&Product_code=PL56195&Category_code=plastimo_Nav_Lights
http://www.plastimo.com/catalogue/index.php?title=Plastimo%20:%20Boat%20equipment%20%20-%20Electricity&catid=10&LangID=1