Duxwing, I thought so too. The specific plants aren't all that interesting hence the buzz around the light preference of the bee possible.
Wolf18 and Meer, it was my first encounter with a big dutch bee in a closed space, and I thought I can't afford any de-tracks from everyday life so I went to the bedroom and closed the door behind me, turned off that light, came out, opened the common room's window with the best position for 'escape' wide, went back to the bedroom, waited a min, then checked out, and that was it - no big bee. Luckily I was alone, no screams and no panic etc.