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Technical
COLOUR RENDERING INDEX (CRI)
The quality of light
A measure of the ability of a light source to reproduce the colours of various objects. A light source with a CRI of 100 (Ra) would be
perfect and balanced in terms of colour reproduction, shading and contrast.
LUMEN DEPRECIATION (L70)
The deterioration in a lights performance after a time
Lumen depreciation values reflect the overall performance of a light source through its life. All light sources suffer from lumen
depreciation, which can be accelerated by poor thermal conditions, over voltage or incorrect application. L70 is the operating
time (hours) until the LED lumen output is depreciated to 70% of its initial lumens.
IP RATINGS
A fittings protection against dust and moisture
Ingress Protection (IP) is a value given to products that have particular protection against dust and/or moisture. The IP number is split,
the first digit represents the level of protection against dust particles while the second digit represents the protection against moisture.
For example IP00 has no protection against dust or moisture whilst a product with IP68 is dust tight and submersible up to 2m (see page
255 for more information).
Cone diagrams
Cone diagrams describe the amount of light at different distances from a fitting and are measured by the lux level.
The intensity of light measured by lux at
distances from the fitting
Distance from the
ceiling in metres
The width the specified light intensity (lux) has spread at a measured
distance (metres) from the fitting
2.1
1
2
3
1
2
3
4.2
6.3
3.3
6.6
9.9
876
217
95
895
224
100
DISTANCE
(M)
DISTANCE
(M)
CONE WIDTH
(M)
CONE WIDTH
(M)
ILLUMINANCE
(LUX)
ILLUMINANCE
(LUX)
Ceiling Level
Understanding colour temperature
The colour temperature of a light source is measured in degrees Kelvin. Below is a Kelvin temperature chart with examples
of how colour temperature is used within different lighting applications.
STREET LIGHTING
High Pressure Sodium
2200K
Standard Incandescent
2700K
Clear Metal Halide
4000K
Cool White Fluorescent
4200K
Natural White Metal Halide
5000K
LIVING ROOMS
KITCHENS & BATHROOMS
OFFICE
1500K
2500K
3500K
4500K
5500K
6500K
7500K
Warm White
Cool White