Lighting

ENERGY ASSOCIATES (PVT.) LTD.
ILLUMINATION CALCULATION
Project Name:
Req. illumination Level (IL)

300

Lux

LUMINAIRE DATA ROOM Manufacturer Lamps (Watts)
Lamp Lumen Depreciation(LLD) Luminaire Dirt Depreciation(LDD)

Area Name Date DOC. REF. Cat. No. Lamps per Luminaire Total Lumens per Luminaire (TL)

4/24/2013 2040 FBH145 1

14 CFL 0.71 1 568

Room Data : Length (L) Width (W) Area (A) CAVITY REFLECTANCES Ceiling 0.5 Walls 0.5 Floor 0.2 4 3 12 M M M2 Ceiling Activity ROOM ACTIVITY Working Plane h= Floor Cavity
FC

h=
cc

0.2 2.05
RC

h=

0.8

Room Index =

LxW h rc x (L+W) = IL x A TL x UF x LLD x LDD

=

12 14.35 0.44

= 0.836237

Utilization Factor (UF) Req. Luminaires =

=

3600 177.4432

= 20.28818

No. of Luminaires Installed (NL) =

20

Calculation Procedure: 1. Determine Required illumination and select light sources and luminiraires 2. Compute Room Index and utilization factor *Room Index=(LengthxWidth)/(effective height x (length + width) 3. Calculate maintenance factor *MF=LLD x LDD 4. Find Required number of luminaires *N= (illumination Required x Area)/(MF x UF x Lamp Lumens)
Calculation Reference:Society of Light and Lighting (2002). Code for Lighting (CIBSE). Publisher, ButterWorth-Heinmann