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Technical
Performance cone
Shows whether the luminaire emits a narrow or wide beam of light and indicates
the lighting level measured at the centre of the beam. The beam diameter and angle
indicate where half the illuminance is measured in relation to the centre of the beam. It
gives only a rough guide of the size of beams narrower than 40°.
Polar curve
The graphic representation of the luminous intensity in different directions. If two curves
are plotted, the distributions are in two vertical planes. The value is indicated in candelas
per 1000 lumen (cd/klm) and therefore must be multiplied by the nominal luminous flux
of the lamp(s) used. The polar curve graph also indicates luminaire efficiency.
Recycling
Havells-Sylvania lamps and luminaires are extremely durable and do not contain any
mercury, lead or other toxic metals. However because their drivers contain electronic
components they must be disposed of as waste electrical and electronic equipment at
the end of their life.
Reflector
An optical component having a mirror surface, which captures light rays from the
source and bounces them back at a particular angle. Although more commonly used
in incandescent and halogen lamps, some Sylvania LED lamps use reflectors to control
their light instead of a lens.
Room index K
An index relating to the dimensions of a room influencing the amount of light emitted
from the fitting onto the working surface.
K = a x b
h x (a+b)
where: a = room length
b = room width
h = height between the luminaire and working surface
Shielding angle (º)
The horizontally measured angle from which the lamp or reflection from it in the
reflector is no longer visible. It is an important measure of glare and, therefore, light
comfort.
Spacing to height ratio (SHR)
Used to determine the maximum distance between luminaires. The ratio of the distance
between adjacent luminaires to the the distance between the luminaire plane and the
horizontal working plane.
Height
Spacing
Switching Frequency
LED lamps cannot be switched on and off indefinitely, but are rated to tolerate an
impressive 60,000 switching cycles or more.
TCO (Total Cost of Ownership
)
TCO includes all the costs over the entire life of a lamp or for a particular operating
time. It covers procurement costs, electricity consumption costs, relamping costs and
may even incorporate a reduction in the necessary air conditioning load. LEDs are
presently more expensive to purchase than lamps based on other technologies, but their
minimal energy consumption results in rapid payback when replacing incandescent and
halogen lamps.
Transformer
A device for reducing the high mains voltage down to a lower voltage. A distinction
is made between conventional (magnetic) transformers and electronic transformers.
Sylvania low voltage LEDs will function on all magnetic transformers, and compatibility
details with electronic transformers are available in the technical data sheets.
Uniformity ratio of illuminance
This indicates the degree of evenness of the light on the working surface and is shown
as a ratio of the minimum to the mean lighting level on a surface. The lower the
number the more disturbing the light.
Ultra Violet (UV) radiation
Comprises electromagnetic waves in the spectral range between visible light and
X-rays, which are invisible to the human eye but essential for all life (delivered via
natural sunlight). Small amounts of UV are emitted by many light sources (e.g. Halogen
and Discharge) and over time will cause fading of coloured objects being illuminated.
Havells-Sylvania lamps and luminaires do not emit any UV radiation.
Utilisation factor
The ratio of the light flux which the reference surface receives to the totalled luminous
fluxes of the installation lamps. This is influenced by the shape of the room and selected
luminaire and is expressed in the form of UF tables.
Volt
The derived SI unit of electrical pressure (symbol V). Low voltage LED lamps (12V)
operate with transformers. High-voltage LED lamps can be operated directly on the
mains supply (220-240V).
Watt
Watt is the SI unit of power and was used for incandescent lamps as an indication
of their light output. Since modern energy saving lamps and LED lamps consume
far less power to achieve the same brightness, however, the wattage is no longer as
meaningful. The lumen value is now used instead.
Wattage Comparison According to ErP
The EU directive for nondirectional light (ErP DIM I) requires a certain luminous flux from
LED lamps to make a comparison with incandescent lamps.
Technical information