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7"
11
1
/2"
◗ Ordering Information
Ordering Code MS400/BU/PS
ANSI Designation M135/M128/S
Product Number 278168
Description Pulse Start Metal Halide
Package Quantity 12
◗ Physical Characteristics
Bulb Size ED-37
Bulb Finish Clear
Base (Nickel Plated Brass) Mogul-Screw
Maximum Overall Length (MOL) 11 1/2'' (292mm)
Light Center Length (LCL) 7.0'' (178mm)
Arc Length 1.57'' (40mm)
Arc Tube Material Quartz
Max. Permissible Bulb Temp. 430ºC (806ºF)
Max. Permissible Base Temp. 210ºC (410ºF)
Max. Bulb to Base Eccentricity 3º
Max.Arc Tube to Base Eccentricity 3º
◗ Operating Characteristics (Photometric)
Approx. Initial Lumens
1,2
42,600
Approx. Mean Lumens
1,3,4
29,820
Rated Average Life, Hours
5
20,000
Correlated Color Temp. (CCT)
3
4100K
CIE Chromaticity Approx.
3
x-.385, y-.400
Color Rendering Index (CRI) 62
Efficacy (lpw) 106.5
◗ Operating Position
Base Up ± 15º–Open or Enclosed Luminaires Unless Otherwise Noted
Note: Pulse Start Metal Halide is Designed for Operation
on Only Approved Ballasts with Metal Halide Pulse Ignitors.
MS400/BU/PS
Lumen Maintenance
BURNING HOURS
RATED AVERAGE LIFE 20,000 HOURS
100%
90%
80%
70%
60%
50%
40%
0 2000 4000 6000 8000 10000
% LUMEN
MAINTENANCE
Pulse Start Metal Halide
400 Watt Lamp (Clear)