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4
5
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