Minimal lights, still good fun
Chances of seeing the a good display of the northern lights on any one night are always going to be poor. I love boats, I love the sea, I love seeing cities at night from the water, so I booked the boat tour on the grounds I'd have a lot of fun whether I saw the lights or not, unlike a coach trip.
Technically the lights were there, although nobody could actually see them. Some people were able to pick them up on their cameras. But it was a lovely evening to be out, looking at the stars and Reykjavik all aglow. The overalls provided by Special Tours were warm enough to stand the cold wind out on deck, and the pick up service from my hotel was on time and flawless.