Before and after same-point comparisonA before-and-after result is meaningful only when the point labels, plane and condition stay matched.

Table PDFBefore and After Lux Comparison Table

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

Comparison field	Before reading	After reading	Boundary
Point and plane	Stable point label and assessed plane.	Same point label and same plane repeated.	Changed point or plane needs a separate comparison.
Lighting state	Existing scene, output level and control state.	Proposed scene, output level and control state.	Do not compare full output with a dimmed state without saying so.
Daylight condition	Daylight, blind state and time condition recorded.	Matched daylight condition or a separate daylight note.	Changed daylight can explain the difference by itself.
Measured lux	Before lux reading with meter position noted.	After lux reading with meter position noted.	One point does not prove every task position.
Equipment change	Existing count, output, optics or maintenance condition where known.	Proposed count, output, optics or maintenance condition where known.	Lux alone does not explain glare, colour quality or energy.
Result note	Reason for the comparison and any visible limitation.	Difference recorded as a measurement note.	The table is not a retrofit success, energy or compliance guarantee.

Related pages