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Lighting Maintenance
- Formulas
by Craig DiLouie and Randy Smith
Lamp Life
Calendar Lamp Life (Years) = Rated Lamp Life (Hours) ÷ Annual Hours of
Operation (Hours/Year)
Lamp Burnout Factor
Lamp Burnout Factor = 1 - Percentage of Lamps Allowed to Fail Without
Being Replaced
Group Relamping
Cost Annualized Cost ($) = A x (B + C) A = Operating Hours/Year ÷ Operating
Hours Between Relampings B = (Percentage of Lamps Failing Before Group
Relamping x Number of Lamps) x (Lamp Cost + Labor Cost to Spot Replace
1 Lamp) C = (Lamp Cost, Group Relamping + Labor Cost to Group Relamp 1
Lamp) x Number of Lamps
Spot Relamping
Cost
Average Annual Cost ($) = (Operating Hours/Year ÷ Rated Lamp Life) x (Lamp
Cost + Labor Cost to Replace 1 Lamp) x Total Number of Lamps
Cleaning Cost
Cleaning Cost ($) = Time to Wash 1 Fixture (Hours) x Hourly Labor Rate
($) x Number of Fixtures in Lighted Space .
Maintenance article
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