DATA SHEET
Precise ™ Alutech ™ MR16
Precise™ Alutech™ MR16
50mm ø Aluminised Mirror Halogen Lamps
20W, 35W, 50W
Description
Aluminised Precise™ Alutech™ MR16 lamps areextra low voltage tungsten halogen reflector-mountedlamps popular for downlighting and accent lightingapplications because of their small size, precise beamcontrol, high efficacy and excellent white light.
Their aluminised mirror directs both visible and infra
red components of emitted light forward preventingthe overheating of lampholders and transformersbehind them. An Aluminised Precise™ Alutech™
MR16 lamp comprises a small halogen low voltagefilament capsule produced with UV control quartzpermanently cemented into a one-piece, aluminiumcoated all glass reflector. The reflector designproduces a precise beam pattern with excellentuniformity and sharp beam cut-off. The reflector isellipsoidal in shape. The filament is precisely alignedalong the optical axis of the reflector during themanufacturing process to achieve the required beam
pattern.
These lamps incorporate an integral clear cover glassto ensure that both bulb and reflector are protectedfrom dust and dirt during installation and operation.
The cover glass effectively eliminates UV-C radiationand greatly reduces UV-B radiation. The use of theCover Glass together with specially developed UVcontrol quartz material for the capsule results inalmost no UV-B or UV-C radiation.
IEC Standards
MIN. –
Dimensions (mm)
A
6.1
B
–
C
1.45
D
49.4
E
–
F
36.8
G
AVE. 5.3 – – – – – –
MAX. – 7.6 46.0 1.60 50.7 5.5 37.7
GE tungsten halogen lamps comply with thefollowing international and British Standards whereapplicable:
EN 60357:2002 / IEC 60357: 2002
Tungsten halogen lamps (nonvehicle)
performance
specifications
EN 60432-3:2002 / IEC 60432-3:2002
Incandescent lamps- Safety
Specification - Part 3: Tungsten
halogen lamps (non-vehicle)
EN 60061-1:2000 / IEC 60061-1:2000
Lamp caps & holders together
with gauges for the control of
interchangeability and safety Part
1. Lamp caps
EN ISO 9001:2000
Quality Management Systems
Requirements
Precise Alutech Data Sheet
© General Electric Company 2003
1
Technical Data
Burning Position: any
Order Code Watt Voltage Max. Max. Peak Beam Colour Rated
(W) (V) Length Diameter Intensity Spread Temp. Avrg.
(mm) (mm) (CD) (°) (K) Life
(h)
Bulb: aluminized, closed, Cap: GU5.3
M269/BAB/CG/AL 20 12 50.5 50.7 450 36 3000 3000
M281/FMW/CG/AL 35 12 50.5 50.7 1300 36 3000 3000
M258/EXN/CG/AL 50 12 50.5 50.7 1800 36 3000 3000
M280/FNV/CG/AL 50 12 50.5 50.7 700 60 3000 3000
MR16 Precise Alutech Performance Cones - Typical Nominal Values
M269
m lux
20W
36° 1 450 ø 0.65 m
2 113 ø 1.30 m
3 50 ø 1.95 m
4 28 ø 2.60 m
5 18
ø 3.25 m
M281 m lux
35W
36°
1 1300 ø 0.65 m
2 325 ø 1.30 m
3 144 ø 1.95 m
4 81 ø 2.60 m
5 52
ø 3.25 m
M258
m lux
50W
36°
1 1800 ø 0.65 m
2 450 ø 1.30 m
3 200 ø 1.95 m
4 113 ø 2.60 m
5 72
ø 3.25 m
M280
m lux
50W
60° 1 700 ø 1.15 m
2 175 ø 2.31 m
3 78 ø 3.46 m
4 44 ø 4.62 m
5 28 ø 5.77 m
Precise Alutech Data Sheet
© General Electric Company 2003
2
Tungsten Halogen Principle
The tungsten filament is enclosed in a gas filled quartz
bulb, together with a controlled quantity of halogen. At
the operating temperature some tungsten vapourizes and
migrates to the cooler areas of the bulb wall where
before it can be deposited, it combines with the halogen
to form a tungsten halide. This circulates until it comes
near the filament where the halide dissociates and
deposits the tungsten back on the filament. This cycle
continues throughout the operating life of the lamp.
As the bulb wall remains clean the bulb size can be
reduced considerably by the use of quartz which can
withstand the high wall temperatures.
The small bulb and strong materials withstand much
higher working pressures, this reduces filament
evaporation, thus offering increased performance either
as more light or longer life.
Light, Life & Voltage
For any particular lamp, the light output and life depend
upon the voltage at which a lamp is operated. For
instance, as approximations, the light output varies as
the 3.6th power of the voltage and the life varies
inversely as the 12th power of the voltage. The Chart
and Tables below illustrate the effects of overvoltage or
undervoltage applied to lamp on its current, life and
light output. The values given (except for long life
lamps) are reasonably valid between 95% and 110%
rated volts.
Beyond this range the indicated characteristics may not
be realised because of the increasing influence of factors
which cannot be incorporated into the chart. The chart
applies only to D.C. or sine-wave A.C. current. The data
may differ particularly for lamp operation on half-wave
rectified voltage, semiconductor dimming devices of
constant operation.
Underrated Bulb Voltages (<100%)
VOLTS % AMPS % LUMENS % LIFE %
99 99.4 96.5 112.8
98 98.9 93.2 127.4
97 98.3 89.9 144.1
96 97.8 86.7 163.2
95 97.2 83.6 185.1
90 94.4 69.2 354.1
VOLTS % AMPS %
Overrated Bulb Voltages (>100%)
LUMENS % LIFE %
101 100.5 103.5 88.7
102 101.1 107.2 79.8
103 101.6 110.9 70.1
104 102.2 114.7 62.5
105 102.7 118.6 55.7
110 105.4 139.6 31.9
Tungsten Halogen Lamps & UV Radiation
Potentially harmful high energy UV-C and UV-B
radiation emitted by the filament are absorbed by the
wall of the capsule which is produced with specially
developed “UVControl” quartz. The use of UV control
quartz together with an optically neutral front cover
glass allows the lamp to fully comply with the latest
stringent requirements of IEC 60432-3.
Operation and Maintenance
• Low voltage tungsten-halogen lamps are sensitive
to voltage variations. Even a small change in
voltage can have a considerable impact on lamp
life (see “Light, Life & Voltage”). Designers
should match fitting transformer ratings to actual
mains line voltages to ensure that the lamps
operate at as close to 12V as possible.
• Rapid cycling can also shorten lamp life, and
designers should take advice from their GE
Lighting representative before using these lamps
in flashing or blinking applications.
• The lamps may be dimmed by reducing voltage.
However, this may cause the bulbs to blacken. If
this occurs the lamp should be run at full voltage
(12V) for fifteen minutes, thereby clearing the
problem. Note that the nature of low voltage
lighting systems requires the use of fluorescenttype
dimmers.
• Switch off mains supply before installing/removinglamp.
• Fuse is essential in circuit.
• Observe temperature tolerances: pinch seal, max.
350°C, bulb wall min. 250°C.
• Lamps should be free from contamination,
including finger marks, before lamp is operated.
Lamps can becleaned with a soft cloth moistened
with alcohol.
• Good condition of the lampholder contacts is
essential.
• Bulb wall temperatures are high and therefore
lamps should not be operated in flammable
atmospheres unless enclosed in suitably rated
luminaires.
• Ensure lamp is cool before removing.
Cool Pinch
Innovative design of all GE dichroic mirror lampshas created a range with probably the lowest pinchtemperature of any comparable lamp. A cool pinch
temperature enables sealed lamps to be used inluminaires designed for open lamps. Excessivepinch seal temperature causes premature lampfailure: the maximum permissible pinch temperatureis 350°C.
GE Consumer & Industrial
Lighting
and General Electric are both registered trademarksof the General Electric Company (USA)
GE Lighting is constantly developing and improving its products. For this reason, all product descriptions in this brochure are
intended as a general guide, and we may change specifications time to time in the interest of product development, without prior
notification or public announcement. All descriptions in this publication present only general particulars of the goods to which they
refer and shall not form part of any contract. Data in this guide has been obtained in controlled experimental conditions. However,
GE Lighting cannot accept any liability arising from the reliance on such data to the extent permitted by law.
October 2003
Precise Alutech Data Sheet
© General Electric Company 2003
3