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.
When replacing fixtures, fully shielded fixtures can generally be specified with no additional cost premium. It may be possible to retrofit existing fixtures with compliant shielding to prevent the need for complete fixture replacement.
Occupancy sensors may be the easiest and most cost-effective way to satisfy interior lighting control requirements in buildings that do not currently have automatic controls for perimeter spaces.
Integration of automated controls into interior lighting systems may require a range of low-to-moderate investment depending on the level of implementation required. However, installation of automatic controls typically gives a favorable payback period of 2–4 years and energy savings of up to 40%–50%.
