Initial output to maintained lumensMaintained output is a recorded assumption chain, not the same thing as measured lux on a plane.

Table PDFInitial vs Maintained Lumens Table

Download the table with the page URL and retrieval date for offline lighting checks.

Output field	Initial-lumen note	Maintained-lumen note	Boundary
Stated output	List the stated lumens for the complete lamp or luminaire at the named condition.	Hold any reduction until maintenance, dirt, ageing or operating assumptions are named.	A stated output line is not a maintained-light result.
Installed output	Multiply stated lumens by the selected count for the same fitting group.	Apply the maintained-light assumptions only after count and output are clear.	Do not mix output values from different zones in one total.
Maintenance factor	Leave the initial-lumen basis unchanged when choosing an MF assumption.	Required lumens rise as MF decreases because the target is maintained light.	MF is an assumption unless supported by measured or documented evidence.
Existing room check	List old lamp or luminaire output only where the basis is known.	Compare with measured illuminance on the same plane and control state.	Unknown ageing can explain why old output and measured lux do not align.
Replacement comparison	List existing and proposed initial output in separate fields.	Compare the maintained-light estimate after MF, UF, count and plane are matched.	Similar initial lumens can still produce a different room result.
Final calculation note	Keep the initial output beside fitting count, watts and optics.	Keep maintained lumens beside target lux, area, UF and MF.	Do not read either field as a compliance guarantee.

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