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Appendix
5
Light planning
Project
Designer Reference Date
Room
Office
Dimensions: Width a m 6,60
Length b m 8,80
Area A=a x b m 2 58,08
Room height hr m 3,00
Luminaire mounting m 2,15
height over workplane h
(for ceiling luminaires
h = hr – 0,85)
Room index k= a x b 58,08 = 1,75
h x (a + b) 33,11
Reflection factors r for ceiling / walls / floor % 70 / 50 / 20
Room purpose
Office with VDU use
Nominal illuminance level E
to DIN 5035 Planning level lx 500 530 500 530
Lamp colour group
to DIN 5035 Actual lamp ww,nw nw ww,nw nw
Colour rendering index
to DIN 5035 Actual lamp 2A 1B 2A 1B
Luminaire type (from Siteco catalogue) 5LP 212 7-1E 5LP 212 B-1E
Mounting location Ceiling recessed Ceiling recessed
Lamp type L58W/21-840 L58W/21-840
Lumen output lm 5000 (HFG) 5200 (low-loss)
Correction factor f 1,00 0,98
Utilisation factor ηB (from table) 0,645 0,645
ηB = hB x f 0,645 0,632
appendix
Lamps required n = E x A = E x a x b 11,3 11,0
f x hB` f x hB x f
Calculated lamps required ( n rounded off) 11 (11) 11 (11)
Lamps used in planning (n`) 12 (12) 12 (12)
Calculation of illuminance level lx 530 540
E = n` x f x ηB`x 0.8
A
Electrical power consumption (total) W 12 x 53 = 636 (HFG) 12 x 67 = 804 (L/L)
Power density W/m 2 10,95 13,84
Luminaire arrangement
3 rows of 4 individual luminaires