Plans, policies and reports
Lighting guidelines
Contents |
Introduction to lighting |
Planning decisions |
Correct lighting decisions |
Technical decisions |
Using the right equipment |
Lighting specifications |
Lighting checklist |
Future work
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Glossary
A
B
| Ballast |
An electrical device used to limit current to lamps. It is inserted between the supply and the discharge lamp. A single ballast can control one lamp or an array of lamps depending on the type and configuration. |
C
| Colour rendering |
An electrical device used to limit current to lamps. It is inserted between the supply and the discharge lamp. A single ballast can control one lamp or an array of lamps depending on the type and configuration. |
| Control gear |
The electrical equipment needed for the operation of the lamp. Can include power factor correction gear. |
D
| Discharge lamp |
A lamp that sends an electrical discharge through an ionised gas to create light. |
E
| Efficacy |
It is a form of measuring the lighting efficiency. It can not be labelled efficiency because it has a unit. For lighting purposes efficacy gives an indication of the number of lumens per Watt of a lamp. The higher the efficacy the better. |
| Enhance prestige |
Lighting designed in such a way that it emphasises certain aspects of a building , structure or object. |
F
| Full cut offt |
A term used to describe light fittings that do not point any light upwards. |
G
| Glare |
Is the discomfort or imparment of vision due to excissively bright lighting. |
H
| Hollistic |
An electrical device used to limit current to lamps. It is inserted between the supply and the discharge lamp. A single ballast can control one lamp or an array of lamps depending on the type and configuration. |
I
| Illuminance |
The measure of illumination. It is the intensity of light falling on a given surface. |
| Inductive (inductor) |
A magnetic effect caused by a current carrying conductor. |
| IP rating |
IP ratings refer to the degree of protection (against dust and moisture) that is provided to the luminaire/lantern by its enclosure. |
J
K
L
| Lamp |
An electrical device that radiates light. |
| LED |
Light Emitting Diode. |
| Light pollution |
Excessive upward pointing light. This occurs when too much light is reflected/pointed upwards to the sky. |
| Lighting column |
Lighting pole used to support the out reach arm of the street light. |
| Lumens |
It is a measure of the perceived power of light. It is the SI unit of luminous flux. The unit is lux/m2 |
| Luminaire |
The light fitting. It includes the lamp and the enclosure. |
| Luminance |
The brightness of the light in a given direction. (cd/m2) |
| Lux |
This is the SI unit of luminance. It is a measure of the intensity of light. |
M
N
O
| Outreach |
The distance from the centre of the luminaire to the edge of the outreach arm. |
| Outreach arm |
The section of the street light that extends out from the light pole. |
P
| Photocell |
A light sensor that measures light levels in a given space. |
| Power Factor |
A ratio of real power to reactive power. A power factor between 0.95 - 1 is acceptable with 1 being ideal. If the power factor should go below 0.95 then the power bill will start rising. Power factor correction can be used for systems with a poor power factor. |
| Power Factor |
A ratio of real power to reactive power. A power factor between 0.95 - 1 is acceptable with 1 being ideal. If the power factor should go below 0.95 then the power bill will start rising. Power factor correction can be used for systems with a poor power factor. |
Q
R
S
| Sky glow |
The effect of light pollution. Light pollution causes the sky to glow. |
| Spill light |
Light that falls outside of the area that it is intended to light. |
| IP rating |
IP ratings refer to the degree of protection (against dust and moisture) that is provided to the luminaire/lantern by its enclosure. |
T
| TCO |
Total Cost of Ownership |
| TLOR |
Total Light Ouput Ratio |
U
| Uniformity |
The measure of how evenly spread the lighting is. It is expressed as a ratio. |
V
W
X
Y
Z
Published November 2008
