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Introduction
Lamp Technology: Key Characteristics
Power in watt (W)
Watt is the 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, the
wattage is no longer as meaningful. The lumen value is now used to
describe light output.
Lumens (lm)
The photometric unit of luminous flux. Luminous flux is the quantity
of visible radiation emitted which is weighted to take into account the
sensitivity of the human eye. There are two measures of lumens used:
• Lumens (non-directional lamps)
This is the total luminous flux of a lamp in all directions.
• Useful lumens (directional lamps)
This is the amount of luminous flux within a 90º cone in the forward
facing direction of the lamp. This will tell you the amount of ‘useful’
light emitted from a directional light.
Candela (cd)
The unit of measurement for luminous intensity in a particular direction.
Instant light
A common issue with many compact fluorescent lamps is that full light
output takes some time and occurs with a period of unpleasant light
and switch delay. Instant light means the lamp illuminates within 1
second and achieves full light output within 60 seconds.
Colour temperature
An approximate indication of the colour impression created by a white
light source. It describes how ‘warm’ or ‘cool’ the appearance of the
light will be. The unit of measurement is degrees Kelvin. Sylvania lamps
are offered in a range of colour temperatures from 2500K Candlelight,
2700K Homelight, similar to incandescent lamps, 3000K Warm white
similar to Halogen, 4000K Cool white to 6500K Daylight.
Lamps are available in a wide range of shapes, sizes and technologies.
The key lamp characteristics are highlighted below. Each lamp type has
its own specific traits, so it’s important to understand these in order to
ensure you’re choosing the right product for your needs.
90° Cone
LED
5.5 Watts
345
lumens
Halogen Eco
40 Watts
325
lumens
Halogen
50 Watts
300
lumens
Lumens example
(Non-directional lamps)
Candela example
Lumens example
(Directional lamps)
(lm)
(cd)
Kelvins example
Cool White
Retail & Supermarket
Neutral colours
Homelight
Residential
Warm colours
2700K
4000K
Daylight
Hospital & Offices
Cool colours
6500K
Watts to lumens examples directional lamps
Watts to lumens examples non-directional lamps
Incandescent
LED
CFL
Halogen
Change to
OR
OR
40 Watts
11 Watts
7 Watts
28 Watts
415
lumens
531
lumens
345
lumens
470
lumens