When the S4L is specified, it designates:
Switch = the pull chain
4 = allowing pull chain to operate the above four sequence steps
L = positioning the pull chain on the left side of the fixture when standing in front of the fixture
When the S4L is specified, it designates:
Switch = the pull chain
4 = allowing pull chain to operate the above four sequence steps
L = positioning the pull chain on the left side of the fixture when standing in front of the fixture