IMAX
2
IMAX
IMAX
2
S/A
S/B
S/C
S/D
S/E
10 - NEWS SPRING | 2019
SYMMETRIC OPTICS
For PERFORMANCE iN LIGHTING, symmetric optics are ones with symmetric
emission in relation to planes α and β.
The symmetry between the two planes may be either identical (in this case we
are dealing with optics with square light distribution) or different (optics with
rectangular light distribution).
EXAMPLE
Symmetric optic code: S/xx
where:
S = Symmetric
xx = the abbreviated name of the opening angle
For example: S/I - S/M - S/W - S/EW
By convention, we consider the beam opening of plane α.
Multiple optics within the same range of opening will be distinguished by
inserting the numerical value of the beam opening at the end.
For example: S/W50 - S/W60
IDENTIFYING AND CLASSIFYING THE OPTICS
PERFORMANCE iN LIGHTING luminaires offer different types
of optics depending on project requirements.
The optic can be identified as the set of equipment designed
to direct the light generated by a light source in a particular
direction, thus determining the luminous emission of the
luminaire itself.
Depending on this luminous emission, PERFORMANCE iN
LIGHTING classifies optics in the following categories:
- Circular (or roto-symmetrical) optics
- Elliptical optics
- Symmetric optics
- Asymmetric optics
- Road optics
- Optics for pedestrian/cycle paths
- Optics for pedestrian crossings
- Symmetrical optics for series of luminaires with double light
emission
The diagram below identifies the data that will be contained
in subsequent pages, regarding the opening angle of the
beam.
Opening
angle α
IMAX = maximum luminous intensity, i.e. the maximum
intensity of the emitted light beam.
Opening angle of the light beam = angle in a plane passing
through the axis of the beam limited by the directions of the
luminous intensities equal to 50% of the lmax.
Based on the opening value α, we can find intensive, medium
or wide optics.
By convention we consider/classify:
Type of beam opening (α)
Identification marking
Intensive
(0° ≤ 20°)
I
Medium
(21° ≤ 45°)
M
Wide
(46° ≤ 75°)
W
Extra Wide
(>75° )
EW
Only for the circular (rotosymmetrical) optics on the contrary
we consider/classify.
Type of beam opening (α)
Identification marking
Intensive
(0° ≤ 20°)
I
Medium
(21° ≤ 45°)
M
Intensive Wide (46° ≤ 60°)
IW
Medium Wide
(61° ≤ 75°)
MW
Extra Wide
(>75° )
EW
SYMMETRIC OPTIC NAME
Mandatory
indications
Additional
indications
Type of optic
Type of opening
Opening angle
plane a
S
I
0° ÷ 20°
M
21° ÷ 45°
W
46° ÷ 75°
EW
over 75°
SYMMETRICAL OPTICS FOR SERIES OF LUMINAIRES WITH DOUBLE LIGHT
EMISSION
With this classification PERFORMANCE iN LIGHTING identifies the light emission
typology of the luminaires inside those series that contain models with direct,
indirect and / or combined light emission.
NAME OF SYMMETRICAL OPTICS FOR LUMINAIRES WITH DOUBLE LIGHT
EMISSION
Type of optic
Acronyms
Typology of light emission
S
Direct symmetrical light
Mainly symmetrical direct light
Evenly direct - indirect symmetrical light
Mainly symmetrical indirect light
Indirect symmetrical light
