1. K. F. Chan (Mr.)ELEC 31051 LUMEN METHOD Utilization factor -- Ratio of flux received by reference plane to total rated lamp flux in the installation. Utilization factor of a lighting installation depends only on polar curve of the luminaire, the room geometry (represented by room index) and reflectances of the ceiling, wall and floor.

2. K. F. Chan (Mr.)ELEC 31052 Maintenance factor – -- LSF -- LLMF -- LMF -- RSMF

3. K. F. Chan (Mr.)ELEC 31053 LUMEN METHOD E= N x n x ø x UF x MF A where MF = LLMF x LSF x LMF x RSMF E =Maintained illuminance, lux A = Area, m 2 Ø = Initial lamp flux, lumen

4. K. F. Chan (Mr.)ELEC 31054

5. K. F. Chan (Mr.)ELEC 31055 LLMF & LSF

6. K. F. Chan (Mr.)ELEC 31056 (Taken from Table 3.4 of CIBSE Code for Lighting, 2002)

7. K. F. Chan (Mr.)ELEC 31057

8. K. F. Chan (Mr.)ELEC 31058

9. K. F. Chan (Mr.)ELEC 31059

10. K. F. Chan (Mr.)ELEC 310510 LMF

11. K. F. Chan (Mr.)ELEC 310511 LMF (Taken from Table 3.5 and 3.6 of CIBSE Code for Lighting, 2002)

12. K. F. Chan (Mr.)ELEC 310512 RSMF

13. K. F. Chan (Mr.)ELEC 310513 RSMF (Taken from Table 3.7 of CIBSE Code for Lighting, 2002)

14. K. F. Chan (Mr.)ELEC 310514