GE G8.5 User Manual
Safety warnings
The use of these products requires awareness of the following safety issues:
GE Consumer & Industrial
Lighting
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.
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.
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
DATASHEET
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
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
• Retail
• Ofces
• Stage/Studio
• Architectural lighting
• Display Cabinet
• Hotels
2
3
Specification summary*
Specification summary*
Ordering Information
Description
CMH20/T/UVC/U/830/G8.5 Plus 20 3000K
CMH35/T/UVC/U/830/G8.5 Plus 35 3000K
CMH35/TC/UVC/U/842/G8.5 35 4200K
CMH70/TC/UVC/U/830/G8.5 Plus 70 3000K
CMH70/T/UVC/U/942/G8.5 70 4200K
20W
Units
Product code 39858 43273 26348 43274 26349
Nominal Wattage
Format
Bulb type
Bulb diameter
Bulb material
Bulb finish
Arc Gap
Base
W 20 35 35 70 70
mm 14.5 14.5 14.5 14.5 14.5
mm 3.35 4.65 4.3 7.4 5.5
3000K
T4.5 T4.5 T4.5 T4.5 T4.5
G8.5 G8.5 G8.5 G8.5 G8.5
Wattage Colour Product Code
39858
43273
26348
43274
26349
35W
3000K Plus
35W
4200K
Single ended
UVC Quartz
Clear
70W
3000K Plus
70W
4200KGeneral
Operating Conditions
20W
Photometric Characteristics
Product code 39858 43237 26348 43274 26349
100 hrs Lumens
Typical Lumen change
with burning position
– vertical to horizontal
Typical voltage change
with burning position
– vertical to horizontal
Correlated Colour Temperature
Chromaticity X
Chromaticity Y
Colour Rendering Index
Luminous efficacy
Base
lm
lm 100-150
V 8
K
Ra
lm/W
3000K
1650 3400 3150 6200 6000
3000 3000 4200 3000 4200
0.435 0.435 0.475 0.435 0.475
0.400 0.400 0.370 0.400 0.370
80+ 84+ 88+ 80+ 90+
85 86 80 86 83
35W
3000K Plus
35W
4200K
G8.5
70W
3000K Plus
70W
4200K
Starting and Warm-up Characteristics*
Time to start ( at 25 °C )
Time to start - Cold box test at -30 °C
Hot restart time
Warm-up time (for 90% lumens)
* Typical values (actual values are ballast and ignitor dependent)
sec. < 2 < 2 < 2 < 2 < 2
sec. < 2 < 2 < 2 < 2 < 2
min. < 3 < 3 15 15 15
min. 1.2 1.2 3 3 3
Burning position
Luminaire characteristics
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.
Universal
Enclosed
Electrical Characteristics *
Lamp power
Lamp voltage
Lamp current
Max. Ignition Voltage
Min. Ignition Voltage
Extinction voltage
(% of rated input voltage)
* 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
W 20 39 39 72 72
V 90 90 90 90 90
A 0.226 0.50 0.50 0.98 0.98
kV *** 5.0 5.0 5.0 5.0
kV *** 3.5 3.5 3.5 3.5
% *** 90 (Max.) 90 (Max.) 90 (Max.) 90 (Max.)
Through life Performance*
Lumen maintenance
at 40% rated life (mean lumens)
Average rated life
* Life data measured in Vertical Base up position. Performance can be greatly increased in horizontal position.
% 68 68 85 71 77
h 12000 15000 12000 15000 15000
Maximum Operating temperatures**
Maximum allowed bulb temperature
(horizontal orientation, thermocouple
attached above burner)
Maximum pinch temperature
(vertical base up orientation)
* 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.
°C
°C
500 500 500 550 550
300 300 300 300 300
4
5
Dimension
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
85 mm MAX
LCL 52 ± 1.0 mm
14.5 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.
1.0 mm
12.0 mm
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