Stevebx,
Two questions, if I may?
Just out of curiosity, what type of bulb is in the fixture: incandescent, fluorescent, compact fluorescent or LED?
While technically a bulb should be completely dark when it's "off", I've seen some that seem to glow for a long time afterward, especially the fluorescents and some LEDs. In fact, we have an LED sign which when shut off, you can still see a slight glow coming from the LEDs when the room is otherwise completely dark. If I pull the plug, they go dark. Apparently just the potential across the bulbs/power supply is enough to allow a trickle current through them so they barely illuminate. I never observed this type of problem with an incandescent bulb.
Second question, while unusual for a stairway, is there a dimmer control on one of the switches?
~Rick
