Philips 278168 manual Ordering Information, Physical Characteristics, Operating Position, 11 1/2

Pulse Start Metal Halide 400 Watt Lamp (Clear)

7"

11 1/2"

MS400/BU/PS

Lumen Maintenance

	100%
LUMEN% MAINTENANCE	90%
	80%
	70%
	60%
	50%
	40%

0 2000 4000 6000 8000 10000

BURNING HOURS

RATED AVERAGE LIFE 20,000 HOURS

◗ 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 Lumens1,2	42,600
Approx. Mean Lumens1,3,4	29,820
Rated Average Life, Hours5	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.