Table of Contents

1 Scope

2 References

3 Definitions

4 General design considerations

5 Natural light in lighting design

6 Classification of lighting installations

7 Design of lighting installations

8 Glare

9 Allowance for light loss with time

10 Luminaires

11 Measurement of illuminance

12 Measurement of luminance

13 Lighting and energy

14 Lighting specifications

Table

1 Values of outdoor illuminance Eo exceeded for various percentages of standard year

2 Characteristics of light sources used for general lighting

3 Colour characteristics of tubular fluorescent lamps manufactured in New Zealand

4 Suggested luminaire and room depreciation (LRD) factors for luminaires in various ambient conditions

5 Relationship between room index and the number of measurement points

6 Recommended minimum circuit efficacies

7 Recommended minimum utilization factors

8 Precautions to be taken when seeking to minimize energy consumption

A1 Daylight factor estimation

A2 Minimum internally reflected component of daylight factor: BRS simplified IRC table

A3 Factors to allow for dirt accumulation on glazing

B1 Recommended standard service illuminances

C1 Approximate Reflectances of typical New Zealand building finishes

D1 Glare indices for symmetrical distributions – floor reflectance 14%

D2 Glare indices for asymmetrical distribution – floor reflectance 14%

D3 Glare indices for symmetrical distribution – floor reflectance 30%

D4 Glare indices for asymmetrical distribution – floor reflectance 30%

D5 Tabular presentation of interpolation for glare index

E1 Table for calculation of aspect factors

E2 E/L values – reference plane perpendicular to the plane of the light source

E3 E/L values – reference plane parallel to the plane of the light source

Figures

1 Availability of daylight in New Zealand

2 Selection of type of installation

3 Adjustment of illuminance for certain factors

4 Useful region of viewing for a particular adaptation level

5 Louvres prevent direct glare, but indirect glare can still occur by reflection from glossy surfaces

6 Luminaires in the offending zone can cause veiling reflections

7 Range of lamp lumen depreciation for fluorescent and other discharge lamps

8 Light loss due to dirt accumulation for various luminaire types

9 Combined depreciation curves showing the effect of cleaning and lamp replacement schedules for an installation using fluorescent lamps

10 Pro-forma lighting specification

A1 BRE sky component protractor for vertical glazing (CIE overcast sky)

A2 Use of BRE Protractor No. 2 to determine the sky component from a vertically glazed window

A3 Derivation of sky component of daylight factor for a vertical rectangular window

A4 Nomogram for the calculation of the average internally reflected component of daylight factor in side-lit rooms

A5 Nomogram for the calculation of the minimum internally reflected component of daylight factor in side-lit rooms

D1 Equivalent ceiling for a rectangular room

D2 Conversion graph for reflectances and flux fraction ratios: floor reflectance factor of 14%

D3 Conversion graph for reflectances and flux fraction ratios: floor reflectance factor of 30%

D4 Conversion graph for downward flux

D5 Conversion graph for luminous area

D6 Conversion graph for height

D7 Transverse and axial polar curves of an asymmetrical luminaire

D8 Asymmetry control distributions ACG 1-4

D9 Asymmetry control distributions ACG 5 and 6: representative prismatic luminaires

D10 Asymmetry control distributions ACG 7 and 8: representative louvred luminaires

D11 Glare worksheet

E1 Illuminance due to a single point source

E2 Vertical tubular sources

E3 Horizontal tubular source

E4 Narrow strip source: point within the luminaire length

E5 Narrow strip source: point outside the luminaire length

E6 Luminous intensity ratios

E7 Aspect factors for parallel planes

E8 Area source with the reference plane perpendicular to the plane of the light source

E9 Area source with the reference plane parallel to the plane of the light source

F1 Typical mortality curve for fluorescent lamps

Appendix

A Methods of daylight factor calculation

B Recommended standard service illuminances

C Surface colours and reflectances

D Calculation of glare index

E Lighting calculations

F Maintenance of lighting installations