There are millions of these fixtures in use, both in rural areas and in our cities and towns as residential streetlights. Nearly half of the light emitted by these Dusk to Dawn fixtures goes directly up into the night sky.
Light is sprayed everywhere, with very little optical control.
A yard light shown with a Skycap installed. Fortunately, there is now a solution to this problem. Hubbell Lighting, Inc. manufactures a unit called the Skycap that is a spun aluminum reflector that replaces the standard prismatic refractor, turning any existing Dusk to Dawn into a full-cutoff light with exceptional optical properties. Because the bulb is mounted vertically, almost all of the light leaving the bulb reflects off the inner surface of the reflector before reaching the ground. What results is an exceptionally uniform and wide distribution of light on the ground.