Utilisation and Maintenance Factor Sensitivity Table
Sensitivity table showing how utilisation factor and maintenance factor assumptions move lumen targets in Australian lighting estimates.
Table PDFUtilisation and Maintenance Factor Sensitivity Table
Download the table with the page URL and retrieval date for offline lighting checks.
| Sensitivity case | UF x MF basis | Effect on required lumens | Boundary |
|---|---|---|---|
| Optimistic clean-room case | UF 0.80 x MF 0.90 = 0.72 combined factor. | Required lumens are divided by 0.72 before fixture count. | Use only when room surfaces, optics and maintenance evidence support it. |
| Ordinary early estimate | UF 0.70 x MF 0.80 = 0.56 combined factor. | Required lumens are divided by 0.56 before fixture count. | Still a planning assumption, not a measured maintained-light result. |
| Lower delivery case | UF 0.60 x MF 0.80 = 0.48 combined factor. | Required lumens rise by about 17% compared with the 0.56 case. | Investigate surfaces, mounting height, distribution and obstructions before adding fittings. |
| Higher depreciation case | UF 0.70 x MF 0.70 = 0.49 combined factor. | Required lumens rise by about 14% compared with the 0.56 case. | The maintenance cause should be named, not hidden inside one number. |
| Difficult condition case | UF 0.50 x MF 0.70 = 0.35 combined factor. | Required lumens rise by about 60% compared with the 0.56 case. | May indicate the room, fitting type or maintenance plan needs review. |
| Measured or photometric case | Project-specific UF and MF basis from applicable method and evidence. | Generic sensitivity rows are replaced by the documented project basis. | The final calculation and installation outcome need the project basis. |