Hi Kendras,
if I remember correctly there was a very nice and detailed lighthouse model made by I don't remember who, available for download here on the subsim forum.
You might also look for free lighthouse models on
3D Warehouse. They are available in .skp format, but most of them can be converted (though with some manual touch-ups) using one of the free versions of sketchup and an obj export plugin also available from the web.
Other than that, I will be glad to help you modelling some realistic lighthouses for the game. For a start, if you like them I will be glad to send your way models of the Düne (Helgoland) front and rear leading lights which I modelled a while back and never released:
The relative position of the two lights and of the buoyage around the two islands of Helgolad and Düne cand be found on the following website (search for Helgoland):
http://map.openseamap.org/
For more information on the lights, please follow the link below:
http://www.subsim.com/radioroom/show...76#post2328576