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Introduction
13
Lamp Technology: Key Characteristics
Beam angle
Indicates the width of the light beam from a directional light source. It
can be thought of as an imaginary cone of light emitted from the front
of the lamp and is defined as the angle at the point where luminous
intensity has diminished to 50% of the candela intensity found at the
centre beam.
The beam angle is particularly important to understand how focussed or
how diffuse you need your light to be when lighting a specific object or
an open space.
Colour Rendering Index (CRI)
This is the ability of a lamp to reproduce the colours it is illuminating
(maximum CRI = 100).
The higher the CRI, the more accurate the quality of the colours of
objects being lit.
Average rated life
For all technologies except LED, average rated life is based on 50%
lifespan from a sample set of lamps. i.e 10000 hours will be the point
at which 50% of lamps are still operating. For LED, life is defined on
either 50% average rated life or 70% lumen maintenance which ever
occurs first.
Lumen maintenance
Every lamp will gradually lose light output over life. The lumen
maintenance will tell you how many percent of the original light is still
generated at a given point in the lamps’ life.
Dimmability
Most conventional dimmers have been designed for incandescent and
halogen lamps and are rated for higher minimum loads than LED or CFL
lamps consume. It is therefore important to ensure that the load applied
to a dimmer matches at least the minimum load stated on the dimmer.
There may be some restrictions in terms of functionality of dimmers
with individual LEDs/CFLs – but when more than one lamp is used
to increase the total of loading, dimming becomes easier. It is also
important not to overload a dimmer to its maximum load.
For further information on dimming and dimmer compatibility
please visit www.havells-sylvania.com or contact your local Sylvania
representative
For more infomation about lamps please go to the Glossary of terms
section of the catalogue
Made in Belgium
Excellent:
art galleries, medical examinations,
colour printing inspections, etc.
Good:
shops, showrooms, restaurants, offices,
etc.
Fair:
security illumination, storage areas, etc.
Poor:
public lighting, carparks, etc.
Less important:
road lighting
100
80
60
40
20
CRI guide
Beam angle examples
Common base types
E14
GU10
E27
B22
GU5.3
G9
25˚
40˚