NEWS | SPRING 2019 - 11
CIRCULAR OPTICS
PERFORMANCE iN LIGHTING identifies those optics that generate a luminous
emission with a symmetry of revolution about the A axis as circular optics.
The opening angle of the beam is generally constant in all planes.
The reflectors generating these optics generally have a circular opening.
EXAMPLE
Circular optic code: C/xx
where:
C = Circular
xx = the abbreviated name
of the opening angle
For example: C/I - C/M - C/IW - C/MW -C/EW
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: C/IW46 - C/IW50
ELLIPTICAL OPTICS
PERFORMANCE iN LIGHTING elliptical optics are circular but differ from roto-
symmetrical circular optics because the opening of the light beam on planes
α and β is symmetric, but differs greatly between the two.
The light distribution is highly elliptical.
EXAMPLE
Elliptical optic code: E α x β
where:
E = Elliptical
α = Opening of the light beam on plane α expressed in degrees
β = Opening of the light beam on plane β expressed in degrees
For example: E 10°x45°
ASYMMETRIC OPTICS
PERFORMANCE iN LIGHTING asymmetric optics generally have asymmetric
light distribution on plane α with a point of maximum concentration.
The axis passing through the point of maximum concentration and the
point marked by the axis of the lamp is called the Imax axis.
The light distribution on plane β, on the other hand, may be symmetric or
asymmetric.
An asymmetric optic may be symmetric in relation to one plane only.
EXAMPLE
Asymmetric optic code: Ayy/xx
where:
A = Asymmetric
yy = numeric value of the Imax angle.
The Imax angle is the angle between axis A and the lmax axis.
xx = the abbreviated name of the opening angle
For example: Ayy/I – Ayy/M – Ayy/W – Ayy/EW.
By convention, the beam opening of plane α is considered.
For example:
A30/M = Asymmetric axis with Imax 30° and Medium opening
A45/I = Asymmetric axis with Imax 45° and Intensive opening
In the presence of multiple asymmetric optics with the same lmax value
and same beam opening range, it will be necessary to distinguish them by
adding the numeric value of the beam opening at the end.
For example: A45/M25 - A45/M40
CIRCULAR OPTIC NAME
Mandatory
indications
Additional
indications
Type of optic
Type of opening
Opening angle
C
I
0° ÷ 20°
M
21° ÷ 45°
IW
46° ÷ 60°
MW
61° ÷ 75°
EW
over 75°
ASYMMETRIC OPTIC NAME
Mandatory
indications
Additional
indications
Type of optic
Imax angle
Type of opening
Opening angle
plane a
A
Numeric value of
the Imax angle
I
0° ÷ 20°
M
21° ÷ 45°
W
46° ÷ 75°
EW
over 75°
luminaire
axis
axis
