I thought it was expensive :lolIf you don't want 10, Buy this one.
http://cgi.ebay.co.uk/Military-Gold...al_Components_Supplies_ET&hash=item33585b788f
Roof lights are only useful if wired to work on their own and used when wading at night so you can turn off submerged lights.
So not a lot of use for most owners.
Brian