WORF: But didn't they say that the Remans see really well in the dark and can't stand bright lights? Why don't we crank up the lights to fullbright and blind 'em?
RIKER: Shut up and just try to look dramatic.
It's funny how a film went out of it's way to establish the Remans from hating bright lights and absolutely no payoff whatsoever. If you watch a film like Back to the Future, almost everything that is given screen time is a set up to a pay off, even building signs. These are the bad guys who upon first meeting them give us a weakness to exploit and they don't go anywhere with it.
Perhaps they were trying to make Riker look more awesome by defeating them in the dark.
I get it that Riker had to go there himself to avenge his woman but I was also wondering where were the rest of the crew. Maybe Riker chucked an early Kirk and insisted I'll deal with these intruders myself as they wronged me personally. Even if thats the case I don't think its Riker's style to endanger the ship like that.
Or maybe the rest of the crew were looking somewhere else. Was it explained why they just couldn't transport the intruders out?