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5.46
Technical data
How fluorescent lamps work
Fluorescent lamps are low-pressure gas discharge
lamps. The glass tube is filled with an inert gas at low
pressure and a small quantity of mercury. The glass
wall is coated with a phosphor. At the ends of the
glass tube are pasted electrodes. When an electrical
charge is passed between them the mercury vapor
emits UV radiation. When the UV radiation hits the
phosphor the phosphor emits visible light. The color
can be varied for different applications by selecting
different phosphor mixes.
Luminous flux and power consumption to IEC 60081
and EN 50285
The minimum luminous flux of a single lamp is 92% of the
rated luminous flux at 25°C; the average is 95% of the
rated luminous flux.
B10:
B10 is defined as the time when 10% of the lamps
have failed (in standardized operation).
B50:
Average life (B50) is defined as the time when 50%
of the lamps have failed (in standardized operation).
Service lifetime:
Service lifetime is the mathematical
lifetime (maintenance multiplied with the % of failed
lamps e.g. B10) for lamps in an installation after which
the installation luminous flux (100 h value) decreased
with 20% (decrease in luminous flux and failed lamps) for
indoor lighting.
Lamp life.
The average life and service life of LUMILUX
®
fluorescent lamps are listed in the table below. Operating
the lamps above or below their rated power will reduce
their service life.
Burning position.
Universal for 26 and 38 mm diam-
eters. When T5 HE and T5 HO lamps are installed in
the vertical burning positions the stamp must be at the
bottom; when T5 FC
®
lamps are installed in the vertical
position the 2GX13 base must be at the bottom. In multi-
lamp fixtures, T5 HE or T5 HO lamps must be positioned
with the stamps next to one another. The recommended
minimum spacing between two T5 lamps is 32 mm for
optimum operation (maintenance of the luminous flux/
temperature curve).
Lamp life in accordance with DIN IEC 60081
(IEC switching cycle
165 min on,
15 min off)
T8
LUMILUX
special length
T8
LUMILUX
standard length*
T8
LLX DE LUXE
T5
HE
T5
HO
T5
FC LUMILUX
T5
LLX DE LUXE
Service life on preheat ECG
16,000
18,000
16,000
19,000
19,000
8,000
19,000
Average life on preheat ECG
20,000
20,000
20,000
24,000
24,000
12,000
24,000
* (18W, 36W, 58W and ES 16W, 32W and 51W) Service life is defined as the time when 80% of the
system luminous flux (relative to the 100 h value) is available.