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LUMEN METHOD

LUMEN METHOD. Utilization factor -- Ratio of flux received by reference plane to total rated lamp flux in the installation.

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LUMEN METHOD

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  1. 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. ELEC 3105

  2. Maintenance factor – -- LSF -- LLMF -- LMF -- RSMF ELEC 3105

  3. 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 ELEC 3105

  4. ELEC 3105

  5. LLMF & LSF ELEC 3105

  6. (Taken from Table 3.4 of CIBSE Code for Lighting, 2002) ELEC 3105

  7. ELEC 3105

  8. ELEC 3105

  9. ELEC 3105

  10. LMF ELEC 3105

  11. LMF (Taken from Table 3.5 and 3.6 of CIBSE Code for Lighting, 2002) ELEC 3105

  12. RSMF ELEC 3105

  13. RSMF (Taken from Table 3.7 of CIBSE Code for Lighting, 2002) ELEC 3105

  14. ELEC 3105

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