In the basement workshop where I set up my darkroom is a recessed light fixture in the ceiling. With a 50 watt light bulb and two layers of red gel. (Rosco #R-27.)
From the center of the room, it is a good six feet away from my work areas where I open my sensitized goods. My safelight tests show that most paper can be in the open for 15 to 20 minutes or more before any noticeable fogging begins to occur.