GE ConstantColor CMH G8.5, ConstantColor CMH Series Datasheet
GE Consumer & Industrial
Lighting
ConstantColor™ CMH™
Ceramic Metal Halide Lamps
Single Ended G8.5
Product Information
Lamp technology
ConstantColor CMH™ lamps combine HPS technology
(providing stability, efficiency & uniformity) and Metal Halide
Technology (providing bright white quality light) to produce
highly efficient light sources with good colour rendering and
consistent colour performance through life. This is achieved
by using the ceramic arc tube material from the Lucalox™
lamp, which minimises the chemical changes inside the
lamp through life. When combined with the halide doses
used in Arcstream™ Metal Halide lamps then the quality
and stability of the dose maintains the colour consistency.
Hence the name ConstantColor CMH™.
Metal halide lamps, traditionally made with quartz arc tubes,
are prone to colour shift through life and lamp-to-lamp
colour variation. Some of the dose, e.g. sodium, (an
important component of metal halide lamps), can migrate
through quartz to cause colour shift and loss of light through
life. The ceramic arc tube resists this material loss, can be
manufactured to tighter tolerances and withstands a higher
temperature to provide a more constant colour.
Features
• Consistent colour over life
• Good colour uniformity lamp to lamp
• Bright light – in a very compact size
• Excellent colour rendition
• Improved reliability due to 3 part design
• Up to 97 Lumen per Watt (LPW) efcacy
• Up to 15,000 Hr life
• UV control
• Colour temperatures 3000K, 4200K
Single ended format
Single ended Ceramic Metal Halide lamps are designed to
provide symmetrical beam distribution using the axial configuration of the discharge arc.
A variety of beam angles are possible and adjustable beam
control can be built into the luminaire.
This compact lamp shape enables luminaire size to be
minimised and the bi-pin lamp base enables easy changing
with front access.
Applications areas
• Retail
• Ofces
• Stage/Studio
• Architectural lighting
• Display Cabinet
• Hotels
DATASHEET
Safety warnings
The use of these products requires awareness of the following safety issues:
Warning
• Risk of electric shock - isolate from power supply before changing lamp
• Strong magnetic elds may impair lamp performance
and worst case can lead to lamps shattering
Use in enclosed fixtures to avoid the following:
• Risk of re.
• A damaged lamp emits UV radiation which may cause eye/skin injury
• Unexpected lamp shattering may cause injury, re, or property damage
Caution
• Risk of burn when handling hot lamp
• Lamp may shatter and cause injury if broken
• Arc tube ll gas contain Kr-85
Always follow the supplied lamp operation and handling instructions.
www.ge.com/eu/lighting
and General Electric are both registered trademarks
of the General Electric Company
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. CMH Single Ended G8.5 Product Information for OEMs 17th July, 2007
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Specification summary*
Ordering Information
Description
Wattage Colour Product Code
CMH20/T/UVC/U/830/G8.5 Plus 20 3000K
39858
CMH35/T/UVC/U/830/G8.5 Plus 35 3000K
43273
CMH35/TC/UVC/U/842/G8.5 35 4200K
26348
CMH70/TC/UVC/U/830/G8.5 Plus 70 3000K
43274
CMH70/T/UVC/U/942/G8.5 70 4200K
26349
20W
3000K
35W
3000K Plus
35W
4200K
70W
3000K Plus
70W
4200KGeneral
Units
Product code 39858 43273 26348 43274 26349
Nominal Wattage
W 20 35 35 70 70
Format
Single ended
Bulb type
T4.5 T4.5 T4.5 T4.5 T4.5
Bulb diameter
mm 14.5 14.5 14.5 14.5 14.5
Bulb material
UVC Quartz
Bulb finish
Clear
Arc Gap
mm 3.35 4.65 4.3 7.4 5.5
Base
G8.5 G8.5 G8.5 G8.5 G8.5
Operating Conditions
Burning position
Universal
Luminaire characteristics
Enclosed
Notes:
1) Lamp voltage in the luminaire should not increase by more than 5V when compared to lamp voltage in free air.
2) Ballast protection required, according to IEC61167.
3) 35W & 70W data is based on operation from a conventional magnetic ballast. Improved performance can be achieved using an electronic ballast.
4) 35W 4200K CMH lamp is based on operation from an electronic ballast. Lamps can run on conventional ballast with a small reduction in performance.
5) 20W designed for operation only from an electronic ballast.
Electrical Characteristics *
Lamp power
W 20 39 39 72 72
Lamp voltage
V 90 90 90 90 90
Lamp current
A 0.226 0.50 0.50 0.98 0.98
Max. Ignition Voltage
kV *** 5.0 5.0 5.0 5.0
Min. Ignition Voltage
kV *** 3.5 3.5 3.5 3.5
Extinction voltage
(% of rated input voltage)
% *** 90 (Max.) 90 (Max.) 90 (Max.) 90 (Max.)
* The specication provides typical performance data for 35W & 70W operating from a 50Hz mains sinewave supply at nominal power. Actual values depend on ballast,
supply voltage and application 20W to be used only with an electronic ballast
*** See additional notes on electronic ballast requirements for 20W
Specification summary*
20W
3000K
35W
3000K Plus
35W
4200K
70W
3000K Plus
70W
4200K
Photometric Characteristics
Product code 39858 43237 26348 43274 26349
100 hrs Lumens
lm
1650 3400 3150 6200 6000
Typical Lumen change
with burning position
– vertical to horizontal
lm 100-150
Typical voltage change
with burning position
– vertical to horizontal
V 8
Correlated Colour Temperature
K
3000 3000 4200 3000 4200
Chromaticity X
0.435 0.435 0.475 0.435 0.475
Chromaticity Y
0.400 0.400 0.370 0.400 0.370
Colour Rendering Index
Ra
80+ 84+ 88+ 80+ 90+
Luminous efficacy
lm/W
85 86 80 86 83
Base
G8.5
Starting and Warm-up Characteristics*
Time to start ( at 25 °C )
sec. < 2 < 2 < 2 < 2 < 2
Time to start - Cold box test at -30 °C
sec. < 2 < 2 < 2 < 2 < 2
Hot restart time
min. < 3 < 3 15 15 15
Warm-up time (for 90% lumens)
min. 1.2 1.2 3 3 3
* Typical values (actual values are ballast and ignitor dependent)
Through life Performance*
Lumen maintenance
at 40% rated life (mean lumens)
% 68 68 85 71 77
Average rated life
h 12000 15000 12000 15000 15000
* Life data measured in Vertical Base up position. Performance can be greatly increased in horizontal position.
Maximum Operating temperatures**
Maximum allowed bulb temperature
(horizontal orientation, thermocouple
attached above burner)
°C
500 500 500 550 550
Maximum pinch temperature
(vertical base up orientation)
°C
300 300 300 300 300
* The specication provides typical performance data for 35W & 70W operating from a 50Hz mains sinewave supply at nominal power. Actual values depend on ballast, supply
voltage and application 20W to be used only with an electronic ballast – see later for additional notes on electronic ballast requirements.
** Temperatures above which lamp performance or reliability is impaired. Additionally, voltage rise when operated in luminaire should not exceed 5V
*** Photometric characteristics refer to lamp performance after 100hrs burning.
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Dimension
14.5 mm
85 mm MAX
LCL 52 ± 1.0 mm
1.0 mm
12.0 mm
Lamp life
Life survival graphs are shown for statistically representative batches of lamps operated under controlled nominal conditions
with a 7 hours per start switching cycle. Declared lamp life is the median value, i.e. when 50% of lamps from a large sample
batch would have failed. Lamp life in service is affected by a number of parameters, including supply voltage variation,
switching cycle, operating position, ballast impedance tolerance, luminaire design and mechanical vibration.
The information provided is intended to be a practical guide for comparison with other lamp types. Determination of lamp
replacement schedules will depend upon relative costs of spot or group replacement and acceptable reduction in lighting
levels.
Note: Representative curves are shown for Vertical Base-Up lamp orientation unless otherwise specied. Life performance is
significantly increased in the Horizontal burning position.
40%
20%
0%
60%
80%
100%
4 6 8 10 120 2
Burning times (thousand hours)
% Lamp survival
CMH 20W G8.5 3000K
40%
20%
0%
60%
80%
100%
4 6 8 10 12 140 2
Burning times (thousand hours)
% Lamp survival
CMH 35W G8.5 3000K and 4200K
40%
20%
0%
60%
80%
100%
4 6 8 10 12 140 2
Burning times (thousand hours)
% Lamp survival
CMH 70W G8.5 3000K and 4200K
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