Minimum shielding for the benefit of birds. No light emitted above horizontal.
Streetlight shielding for human benefit. Shielding should be adjusted so that direct light is limited to an area roughly two pole-lengths away.
Streetlight shielding to eliminate light trespass. Streetlights should have more shielding toward private property.
A demonstration streetlight. No light is emitted outside the area illuminated on the ground.
Close-up of the well-shielded light above. The shielding is easily adjustable to fit the location.
A well-shielded streetlight as seen from two pole-lengths away. The direct light from the streetlight is barely visible, and not a source of glare.