If manual overrides are available for occasional after-hours use, check that lighting system controls are restored to normal shut-off schedules following any overrides.

Confirm that automatic controls are properly managing interior lighting.

All Options – Interior Lighting Systems

Facilities staff can perform these modifications, making costs minimal.

Remove unnecessary lighting of architectural and landscaping features.

Redirect exterior lighting wherever possible to direct downwards rather than upwards to reduce night sky illumination.

Minimize light trespass at the LEED project boundary, and develop a plan for performing required measurements during the performance period.

Measure the night illumination levels at regularly spaced points around the perimeter of the property, taking the measurements with the building’s exterior and site lights both on and off. The building’s interior lights must be in the same state during both measurements.

Option 3 – Measure Site Perimeter Illumination

Costs will vary depending on the number of fixtures or lamps that must be retrofitted or replaced to meet the shielding requirement. Reducing wattage may be less expensive in some cases than adding shielding.