Something I don't see mentioned on here is the huge difference in intensity between household lights and sunlight.
I've never much worried about house lights, whether they be incandescent, CFL, or LED. My beers ferment in the dark, and I don't see any issues from household lighting when transferring.
That being said, the place where I transfer beers is in direct sunlight most of the day, so I typically transfer on cloudy days or after sunset. This will change soon.