I find that safelight is most useful when I need to move the paper from developer to stop. Naturally, at this point, I can use high enough level of illumination to comfortably fish the paper from the developer tray. The level I use at this point causes some minor fogging after 30 seconds if used before developer, but when used when the developer time is up, the paper receives only less than 15 seconds of development after the exposure.
"General" illumination has to be very low level, still better than nothing; but if used only "when you need it" and "where you need it", the level can be substantial; test it first.
I use general yellow LEDs as is. Proper Wratten 13 filter added would probably allow me to double the illumination level.