Inputs
Results
Supplied maintenance factor
--
Current retained factor
--
Current maintained lumens
--
lm
Current lost lumens
--
lm
Curve note
--
Calculation details
- Supplied maintenance factor
- --
- Current retained factor
- --
- Current maintained lumens
- -- lm
- Current lost lumens
- -- lm
- Current retained performance
- -- %
- Lumens at 25% of reference hours
- -- lm
- Lumens at 50% of reference hours
- -- lm
- Lumens at 75% of reference hours
- -- lm
- Lumens at 100% of reference hours
- -- lm
- Curve note
- --
Important notes
- The straight-line curve is a planning representation between the initial state and the supplied maintenance factor; it is not a product life model.
- Use dated product data, environment assumptions, and a maintenance schedule for project decisions; this calculator does not declare compliance.
Formulas
- \(\displaystyle MF = LLMF \times LMF \times RSMF\)
- \(\displaystyle E(t) = E_0 \times [1 - (1 - MF) \times t]\)
Estimate maintained lumens and a transparent planning curve from product retention assumptions and operating hours.
Lumen Depreciation and Maintenance Calculator is a planning aid. Keep the target source, product data, measurement method, and project assumptions with the result. Confirm compliance, installation, certification, and safety decisions with the responsible professional.