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533

LIGHTING SOLUTIONS

CA452001EN - March 2015

Technical

Emergency Lighting Spacing Tables

To enable photometric designs to be performed as required by

BS 5266 pts 1 and BS EN 1838, the following factors need to be

used to ensure that the worst case conditions are designed for.

Initial lamp lumens of the lamp must be de-rated by:

• Ballast lumen factor (for emergency circuits, these are

independently tested and their % value is shown)

• K Factor for the effect of reduction in supply voltage as the

battery discharges, and of cable voltage drop on central

systems

• S Factor to compensate for the ageing of lamps during service

life

The effect of dirt on the diffuser must also be allowed for, so

an allowance for 20% as recommended by ICEL has been built

into these spacing tables. If the design is being produced on a

computer, similar allowance should be made.

System lumen reduction factors used in the following lumens chart

are:

System Type

Self-Contained

24 Volt Slave

50 & 110 Volt Slave

230 Volt Inverter Slave

K Factor

0.85

0.65

0.7

0.95

S Factor

0.85

0.85

0.85

0.85

QX Range

50 & 110 Volt Slave

230 Volt Inverter Slave

Watt

Lumen

Type

BLF

ELDL

BLF

ELDL

ELDL

Linear Lamps

14

1200

BQX14

0.14

142

0.43

516

1140

21

1900

HC1

0.10

161

0.43

817

1805

24

1750

HE1

0.08

119

0.30

525

1662

28

2600

HD2

0.08

178

0.41

1066

2470

35

3300

HE1

0.10

280

0.38

1254

3135

49

4300

HE1

0.07

255

0.28

1204

4085

54

4450

HE1

0.05

189

0.23

1023

4227

80

6550

-

0.04

222

0.18

1179

6222

18

1350

BQX

0.10

115

0.44

504

1282

36

3350

BQX

0.09

256

0.33

939

3182

58

5200

CQX

0.06

265

0.24

1060

4940

70

6550

DQX

0.05

278

0.18

1002

6222

Compact Lamps

16-2D 1050

BQX

0.13

100

0.65

892

997

28-D

2050

-

-

-

0.4

1742

1947

38-2D 2850

-

-

-

0.33

2422

2070

13-TCD 900

BQX

0.14

107

0.63

567

855

18-TCD 1200

BQX

0.07

71

0.37

1020

1140

26-TCD 1800

HD1

0.06

91

0.42

756

1710

32-TCD 2200

HD1

0.06

112

0.45

990

2090

42-TCD 3200

HD1

0.06

163

0.41

1312

3040

40-TCL

3500

EH

0.05

149

0.25

875

3325

55-TCL

4800

EH

0.04

151

0.21

1008

4560

When applied with the appropriate K Factors the following

Emergency Lighting Design Lumens (ELDL) for typical fluorescent

lamps which can be used for calculations:

Note that lamp lumen depreciation (S factor and factors for

Luminaire Maintenance Factor LMF should be applied to the

calculation)

Design procedure for Converted Mains Lighting Luminaires

When normal mains luminaires are converted and utilised for

emergency use, the procedure below should be followed:

1. The table of emergency lighting design lumens (above), should

be consulted to determine the minimum emergency lamp

output for the particular lamp/circuit required, for use with either

spacing tables or a computer design program.

Use of Spacing Tables with Computer Programs

Computer programs can provide accurate values for specific

applications, using data for the exact luminaire, at the precise

mounting height and with the actual emergency lamp output, for

any luminaire configuration a design can be carried out or validated

against BS5266-1: 2011 and EN1838: 2013.