Maintenance is vital to lighting efficiency. Light levels decrease over time because of aging lamps and dirt on fixtures, lamps, and room surfaces. Together, these factors can reduce total illumination by 50% or more, while lights continue drawing full power.
The following basic maintenance suggestions can help keep your lights operating at their optimum energy efficiency:
Clean or repaint small rooms every year and larger rooms every 2–3 years. Dirt collects on surfaces, which reduces the amount of light they reflect.