Lumen Depreciation Calculator

How Lumen Depreciation works

The governing expression is maintained lumens = initial × maintenance fraction. Lumen Depreciation uses Initial lumens, Lumen maintenance to report Maintained lumens. For luminous intensity, use Candela Lumens Calculator.

With the loaded values, maintained lumens evaluates to 8,000.00 lm. Label alternate cases before adjusting an assumption.

Inputs for Lumen Depreciation

Initial lumens and Lumen maintenance belong to Lumen Depreciation. Keep source units with initial lumens.

Actual ratings and readings should replace the demonstration values.

Initial lumens

Example entry: 10000 lm.

Lumen maintenance

Example entry: 80%.

Reading the Lumen Depreciation result

This output represents Lumen Depreciation.

Keep the calculated requirement separate from the rating ultimately selected.

Measurement and units

Photometric results depend on fixture distribution, reflectance, mounting, maintenance, and the measured task plane. Check prefixes on initial lumens.

Normalize units before judging one electrical case against another.

Limits of this calculation

Dirt and room-surface depreciation may require additional factors.

Additional electrical behavior needs its own measurement or calculation. Unentered effects remain outside Lumen Depreciation.

A useful Lumen Depreciation comparison

Record maintained lumens before testing a different initial lumens value.

Document the alternate initial lumens source.

Lumen Depreciation record notes

Record source and operating details for initial lumens.

Retain raw maintained lumens beside its selected rating.

Questions about Lumen Depreciation