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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.