julesmoto said..
Maybe because it's a bit of an oddball law
No it is not an "oddball law"!!
It is, and has been for centuries, a common law of the seas that vessels during the hours of darkness display lights that indicate the presence of the vessel and whether the vessel is underway, anchored, moored or disabled or whatever.
It is a common sense thing which seems to be a rarity in practice lately.
You could try your insurance policy out to see if it will cover the loss of your vessel in the instance where another vessel collides with your unlit vessel causing a total loss of your vessel.
Would cable tying a few of these to your pullpit, pullpit or stanchions stress you financially??
www.bunnings.com.au/click-libre-solar-led-pathway-light_p0180287