|
Lumen
|
GLS
|
Hal
|
Mbf
|
Son
|
M/Hal
|
Sox
|
|
Output
|
||||||
| 50,000 | ||||||
| 49,000 | ||||||
| 48,000 | ||||||
| 47,000 |
400
£128 |
|||||
| 46,000 | ||||||
| 45,000 | ||||||
| 44,000 | ||||||
| 43,000 | ||||||
| 42,000 | ||||||
| 41,000 | ||||||
| 40,000 | ||||||
| 39,000 | ||||||
| 38,000 |
400
£128 |
|||||
| 37,000 | ||||||
| 36,000 | ||||||
| 35,000 | ||||||
| 34,000 | ||||||
| 33,000 |
1500
£480 |
|||||
| 32,000 | ||||||
| 31,000 | ||||||
| 30,000 | ||||||
| 29,000 | ||||||
| 28,000 | ||||||
| 27,000 |
250
£80 |
|||||
| 26,000 | ||||||
| 25,000 | ||||||
| 24,000 | ||||||
| 23,000 | ||||||
| 22,000 |
1000
£320 |
400
£128 |
||||
| 21,000 |
250
£80 |
|||||
| 20,000 | ||||||
| 19,000 | ||||||
| 17,000 | ||||||
| 16,000 | ||||||
| 15,000 |
750
£240 |
150
£48 |
||||
| 14,000 | ||||||
| 13,000 |
250
£80 |
150
£48 |
||||
| 12,000 | ||||||
| 11,000 | ||||||
| 10,000 | ||||||
| 9,500 | ||||||
| 9,000 |
500
£160 |
|||||
| 8,000 | ||||||
| 7,600 |
55
£17 |
|||||
| 7,000 | ||||||
| 6,500 | ||||||
| 6,300 |
125
£40 |
|||||
| 6,000 | ||||||
| 5,800 |
70
£22 |
70
£22 |
||||
| 5,000 | ||||||
| 4,800 |
300
£96 |
|||||
| 4,500 |
35
£11 |
|||||
| 4,000 | ||||||
| 3,800 |
80
£25 |
|||||
| 3,300 |
50
£16 |
|||||
| 3,100 |
200
£64 |
|||||
| 2,500 | ||||||
| 2,100 |
150
£48 |
50
£16 |
18
£6 |
|||
| 1,800 | ||||||
| 1,200 | ||||||
| 1,000 |
100
£32 |
|||||
| 500 | ||||||
|
Lumens
|
GLS
|
Hal
|
Mbf
|
Son
|
M/Hal
|
Sox
|
Based on annual running costs for 4,000 hours (@8p per kW /h)
Factors not included:
Lamp cost:
Lamp life:
GLS - 1000 hrs
HAL -Halogen - 2000 hrs
M/Hal - Metal Halide - 6,000 hrs
Mbf - Mercury - 16,000 hrs
Son - Sodium - 24,000 hrs
Sox - 16,000
Maintenance and lamp replacements
Cost of Fitting:.Starting time requirement
|
Lamp
|
Colour Temp. (K)
|
Colours enhanced
|
Colours subdued
|
.
|
|---|---|---|---|---|
|
SON
|
2100
|
yellow orange
|
blue green red
|
yellow
functional |
|
GLS
|
2700
|
orange red
|
blue green
|
"cosy" warm
|
|
HAL
|
2900
|
orange red
|
blue green
|
"crisp" warm
|
|
MBF
|
4000
|
blue green
|
yellow red
|
neutral
white |
|
M/HAL
|
5000
|
blue green
|
.
|
fresh
active |
|
.
|
5000 +
|
.
|
.
|
daylight
|
Halogen Lamp
A short name for the tungsten-halogen lamp. Halogen lamps are high pressure incandescent lamps containing halogen gases such as iodine o bromine which allow the filaments to be operated at higher temperature and higher efficacies. A high-temperature chemical reaction involvin tungsten and the halogen gas recycles evaporated particles of tungste back onto the filament surface.
High-Intensity Discharge (HID) Lamp
A general term for mercury, metal halide and high-pressure sodium lamps. HID lamps contain compact arc tubes which enclose various gases and metal salts operating at relatively high pressures and temperatures.
High-Pressure Sodium (HPS) Lamp
HPS lamps are high intensity discharge light sources which produce light by an electrical discharge through sodium vapor operating at relatively high pressures and temperatures.
Incandescent Lamp GLS
A light source which generates light utilizing a thin filament wire (usually of tungsten) heated to white heat by an electric current passing through it.
Mercury Lamp
A high-intensity discharge light source operating at a relatively high pressure (about 1 atmosphere) and temperature in which most of the light is produced by radiation from excited mercury vapor. Phosphor coatings on some lamp types add additional light and improve colour rendering.
Metal Halide Lamp
A high-intensity discharge light source in which the light is produced by the radiation from mercury, plus halides of metals such as sodium, scandium, indium and dysprosium. Some lamp types may also utilize phosphor coatings.
Average Rated Life
The median time it takes for a lamp to burn out. For example, a 60-watt Soft White bulb can be expected, on the average, to burn for 1,000 hours. Based upon continuous testing of lamps in laboratories, the 1,000 hour rating is the point in time when 50% of the test samples have burned out and 50% are still burning.
Lumen
The international (SI) unit of luminous flux or quantity of light. For example, a candle provides about 12 lumens. A 60-watt Soft White incandescent lamp provides 840 lumens.
Lumens Per Watt (lpW)
A measure of the efficiency, or, more properly, “efficacy” of a light source. Efficacy is easily calculated by taking the lumen output of a lamp and dividing by the lamp watts. For example, a 100-watt lamp producing 1750 lumens has an efficacy of 17.5 lumens per watt.
Typical lamp efficacies:
| Edison’s first lamp | 1.4 lpw |
| Incandescent lamps | 10- 40 |
| Halogen incandescent lamps | 20- 45 |
| Fluorescent lamps | 35- 100 |
| Mercury lamps | 50- 60 |
| Metal-halide lamps | 80- 115 |
| High-pressure sodium lamps | 100- 140 |
Note: the values above for discharge lamps do not include the effect of the ballasts which must be used with those lamps. Taking ballast losses into account reduces “system” or lamp-ballast efficacies - typically by 10-20 percent depending upon the type of ballast used.