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P
E
R
F
O
R
M
A
N
C
E
26°+28° 62°
h(m)
ØC
0
(m) ØC
90
(m)
4
2.15+3.42 4.72
8
4.29+6.83 9.46
12 6.44+10.25 14.18
16 8.59+13.67 18.50
20 10.73+17.08 23.64
E(lx)
538
135
60
34
22
GONIOPHOTOMETER
PHOTOMETRIC
TESTING OF A
LUMINAIRE
Environmental conditions affect the
stability of the light sources and therefore
the value of the emitted flux. For this
reason the controlled temperature inside
the laboratory must be kept at 25°C with
a tolerance of ± 1°C.
Even air speed is monitored and kept
constant in order to create the optimal
conditions for lamp testing, particularly
for fluorescent sources, that emit the
maximum flux at 25°C.
POLAR DIAGRAM
AND
ILLUMINANCE
VALUES
The output of a lamp is a percentage
value that expresses the ratio between
the flux emitted by the fitting and by the
source. Such value comes out from the
average of at least 8 measurements.
Innovation and reliability
The
GO-DS 1600
system uses
LMT Limes
2000
, a Windows-based software for the
measurement of photometric data.
The collected data produces reports based
on different standards as well as graphic
displays of light distribution and isolux
diagrams.
From such data, photometric libraries can
be created in IES and EULUMDAT formats,
compatible with the American and the
European standard respectively.
LABORATORY
EQUIPMENT
The new photometric laboratory
complies with the normatives
EN 13032 and is certified by
IMQ Performance.
IMQ Performance certifies not only the
absolute reliability of photometric
measurements, but also the performances
and the energy efficiency of each
luminaire.
The goniophotometer is a measuring
apparatus including a luxmeter and a
revolving elliptical mirror. It is provided
with a housing to install fittings or light
sources. The housing allows the light
source to revolve round a vertical axis
while maintaining its correct working
position.
The light source is given a rotating
centre and it revolves round its own axis
through a spiral movement. While the
light source is revolving, the light beam
passes through three diaphragms and
reaches the luxmeter.
The data is captured by the luxmeter
and the luminous intensity is determined
through a conversion formula.