JCC Catalogue 30

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248 Technical
WATTAGE (VA)
A measure of the energy consumed by a fitting
A measure of power or the rate of energy consumption by an electrical device when it is in operation, calculated
by multiplying the voltage at which an appliance operates by the current it draws (Watts = Volts X Amperes).
LUMENS
A measure of light output
A lumen is a unit of measurement that is used to express how much illumination a source of light provides.
LIGHT OUTPUT RATIO (LOR)
The proportion of light that finally leaves the light fitting
This is a measure of the efficiency of the fitting and is a ratio of the lumens leaving the light source and the
lumens that finally leave the fitting.
LUMENS PER CIRCUIT WATT (LPCW)
The efficiency of the fitting
A calculation of the efficiency of a fitting. Lumens (3000) ÷ Wattage (50W) = 60 LpcW
LUX
A measure of light intensity
A measure of the intensity of light as seen by the human eye and measured by luminous flux per unit area.
One lux is equal to one lumen per square metre.
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Wattage (VA)
Lumens per circuit Watt (LpcW)
Light Output Ratio
1 metre
2 metres
3 metres
Lux
200 lux
150 lux
Lumens
Distance from fitting
Lighting explained
A GUIDE TO COMMONLY USED TERMS WITHIN LIGHTING
For full information on understanding lighting performance, visit
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