Philips Indoor Luminaires Indoor Furnishings User Manual


  Open as PDF
of 78
 
Lighting technique
Technical data
Philips indoor luminaires Technical data 12.53
Beam characteristics – K-beam categories
Accent lighting requires a controlled beam of light, which is achieved
usingalampandreector,orareectorlamp.Theultimateeffectis
largely determined by the characteristics of the beam. The important
factors are the intensity, the shape and the dimensions of the spot of
light created by the beam and the amount of spill light. Spill light is the
amount of light allowed to spread outside the actual beam.
A ‘hard-edged’ beam is a light beam with little or no spill light that
givesasharplydenedcontrast.Itlendsitselftoverydramaticlighting
effects.
A ‘soft-edged’ beam has a higher degree of spill light and will result
in a lower contrast with the surrounding area. The effects are much
softer than those obtained with a hard-edged beam. To help you make
therightselection,Philipshasabeamclassicationforitsreector
lampsandlamp/reectorcombinations,whichidentifyveK-beam
categories.Theultimateeffectisinuencedbythecontrastbetween
the ambient lighting and the lighting intensity of the beam.
Identifying the ve K-beam categories
The illustrations here give a good impression of the effects of
thevarioustypesoflightbeamsidentiedbythePhilipsK-beam
classication.Thelightbeamscreatetheseeffectswithoutany
supplementary lighting.
K1 is a prole spot without spill light;
this effect is achieved by equipping the
luminaire with a mechanical diaphragm
or optical device that cuts off the spill
light; in this way, beams of different
shapes can be produced.
This class can have high- or low-
intensity beams, depending on the lamp
power and efciency of the system.
K2 is a spot which stands out due to its
sharp transition to a minimal amount of
spill light; this type of beam is excellent
for creating theatrical and dramatic
effects.
This class is usually associated with very
high-intensity beams.
K3 shows a hard transition from a high-
intensity spot to spill light; the spill light
is seen as a narrow ring of light around
the spot.
This class is usually associated with
high-intensity beams and is very
suitable for creating theatrical effects.
K4 creates a soft shift from a relatively
strong spot to a great amount of spill
light; the spill light assists considerably in
lighting the general surroundings.
K5 is a uniformly wide beam without
a visible spot and is suitable for general
or supplementary lighting.
Indoor_2008_Chapter_12_LIS.indb 53 20-05-2008 14:35:49
 previous next