Dark Sky Friendly

There has been a Dark Sky Friendly initiative over recent years to address nuisance lighting and light pollution. Recent changes in exterior lighting ordinances are moving from non-cutoff and semi-cutoff light optics to controlled lighting (cutoff) and dark-sky–friendly (full-cutoff) fixtures to reduce glare, light trespass, and urban sky glow. Progress Solar Solutions is committed to providing the most environmentally friendly lighting solutions available, including full-cutoff and cutoff fixtures in our solar outdoor lights where needed.

Light Optics - Control of Light Distribution

Full-cutoff - used in dark-sky–friendly locations to minimize light pollution; optics direct the light on the ground below the fixture; light not allowed to emit above 90 degrees.
Cutoff - controlled lighting; <2.5% of the light is allowed to escape the fixture above 90 degrees.
Semi-cutoff - vast majority of the light is emitted below 90 degrees.
Non-cutoff - light is emitted in all directions.

*"Cutoff" is often also referred to as "shielded."