LUMEN METHOD E= N x n x ø x UF x MF A

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Presentation transcript:

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, m2 Ø = Initial lamp flux, lumen K. F. Chan (Mr.) MEBS6002

LUMEN METHOD Utilization factor Ratio of flux received by reference plane to total rated lamp flux in the installation. Maintenance factor – -- LSF -- LLMF -- LMF -- RSMF K. F. Chan (Mr.) MEBS6002

K. F. Chan (Mr.) MEBS6002

K. F. Chan (Mr.) MEBS6002

K. F. Chan (Mr.) MEBS6002

K. F. Chan (Mr.) MEBS6002

LLMF & LSF K. F. Chan (Mr.) MEBS6002

(Taken from Table 3.4 of CIBSE Code for Lighting, 2002) K. F. Chan (Mr.) MEBS6002

LMF K. F. Chan (Mr.) MEBS6002

LMF (Taken from Table 3.5 and 3.6 of CIBSE Code for Lighting, 2002) K. F. Chan (Mr.) (Taken from Table 3.5 and 3.6 of CIBSE Code for Lighting, 2002) MEBS6002

RSMF K. F. Chan (Mr.) MEBS6002

RSMF (Taken from Table 3.7 of CIBSE Code for Lighting, 2002) K. F. Chan (Mr.) MEBS6002

K. F. Chan (Mr.) MEBS6002