Here are my thought: different publications and organizations use different manuals of style - I know the WP MoS, but not the CG MoS. According to the WP MoS, lighthouse and light should be lower case. If there is discrepency, common useage trumps other MoS styles. In that instance, lighthouse and light are lower case, as they are usually not capped. Gateman1997 informs me lighthouse and light are part of the proper name, in which case they are capped. I believe Dalbury leans towards that position as well. My position: we need to decide, and be consistent. I know the WP MoS, I don't know lighthouses as well. It would be nice if we had a lighthouse project, but we don't, and capitalization was inconsistent. I made them consistent per WP MoS and what I thought trumped, which is WP MoS over differing styles. If the light is part of the proper name and there is significant reason to cap, I will go through and move all the lighthouse and light articles and fix the redirects. I just want to ensure we have consensus prior to doing that. Is there a situation where upper case L would not be appropriate? It may not be feasible to have consistency.  
 :::::I appreciate your time and effort on this - thanks much for your input!