@Timm R Oday25 I think
@Kings Gambit hit the nail on the head. If you'll read my earlier post quoted here for your ease of reading I said "it is a matter of what the regulations require and whether the locals or the USCG enforces the regulations where you are located." From the look of your chart it is not a Special Anchorage so not exempt from the lighting requirements. Even if its on the charts as a mooring field, that does not make it a Special Anchorage and exempt from the lighting requirements.
It is possible that the Coasties just consider it a waste of time to cite for this or possibly don't really know the requirements themselves. Many people do not consider being on a mooring "at anchor" but it is, none-the-less. Heck, you're supposed to display a black ball too at least above a certain size boat, but NOBODY does that (including me). If you can't see the boat in broad daylight then the black ball isn't going to do any good either. I wouldn't open the can-o-worms by formally asking the Coast Guard. (We did by the way) I guess you figure its better to plead ignorance of the law.
However, the rub comes when there is an accident and somebody runs into your anchored (moored) boat at night when you don't have a anchor light rigged. "But judge, it was dark and there wasn't a single light on that boat, what was he doing there?" Don't you think any lawyer worth his salt would latch on to that and put the moored boat at least partially at fault? Maybe I'm a little sensitive to that aspect since our mooring field is right on the ICW and my boat is the furthest out from the shore. I've displayed an anchor light since the day I put it on the mooring in 2013.