The
maximum value obtained optimum
ambient temperature, with losses increasing
at higher and lower temperatures.
.
The rated luminous flux generally speci-
fied for ambient temperature 25°C.
%
100
80
60
40
20
T26 W
T16
T26 W
-20 °C
Ambient temperature
(dashed line)
Luminous
flux
Ambient temperature
Luminous
flux
T16 fluorescent lamps
In comparison with thicker T26 lamps (dia
meter: mm), modern T16 lamps (diameter:
16 mm) show several different properties that
must taken into account for application. The T16
basically follows the same curve the
T26, but the maximum occurs not an
ambient temperature 25°C but at
about 35°C.
Amalgam technology
Special T16-I lamps with amalgam technology
are available order ensure that the
luminous flux slightly less temperature
dependent.
Reason: the cool spot T16 not located
in the centre the lamp, but typically at
one end the tube where the manufacturer
has fixed its seal.
Adding amalgam mercury compound)
makes possible compensate for the
decrease luminous flux relatively high
and low temperatures.
For the T16, the maximum value therefore
lies above this rated value.97
The Lighting Handbook
%
100
80
60
40
20
0
-10 20
10 °C
T16-I (amalgam lamp)
Relative luminous flux %
Min. relative luminous flux %
Application hints
Luminous flux temperature curve
As for all fluorescent lamps, the lamp’s
luminous flux temperature-dependent. Thus luminaire
efficiencies may have levels greater than “1”
