The upward distribution of more than 60 percent of total lamp lumens provides effective illumination for overhead buss bars, disconnect switches, insulators and fuses. Vertical and horizontal light
enables quick identification of open switches from ground level. Original light output can be restored by thorough cleaning, while the natural cleansing action of rain maintains continuing high operating output. Sealed gasket assemblies around the top and bottom of the refractor keep the interior of the unit dirt and weather tight for many years.