GE G8.5 brochure Lumen maintenance, Special power distribution, Distribution of luminous intensity

Page 4

Lumen maintenance

Lumen maintenance graphs show light output performance through life for statistically representative batches of lamps operated under controlled nominal conditions with a 7 hours per start switching cycle. A common characteristic for all metal halide lamps is a reduction in light output and a slight increase in power consumption through life. Consequently there is an economic life at which lamp efficacy falls to a level when lamps should be replaced to restore design illumination levels. Where a quantity of lamps are installed within an area, consideration should given to a group lamp replacement programme

Special power distribution

Spectral Power Distribution curves are given in the following diagram

to maintain uniform illumination levels. Curves represent operating conditions for a 7 hours per start switching cycle, but less frequent switching will improve lumen maintenance.

Note: The representative curves are shown for Vertical Base-Up lamp orientation unless otherwise specified. Lumen maintenance performance is significantly improved in the Horizontal burning position.

Lumen Maintenance 20W G8.5 3000K

 

100

 

95

 

90

Initial

85

80

% of

75

 

70

 

65

 

60

[mW/nm x lm]

Spectral Power Distribution [3000K]

70

60

50

40

30

20

10

0

380

430

480

530

580

630

680

730

Waveleennggth [nnmm]

[mW/nm x lm]

Spectral Power Distribution [4200K]

70

60

50

40

30

20

10

0

380

430

480

530

580

630

680

730

Wavelleennggth [nnmm]

0

2

4

6

8

10

12

Burning time (thousand hours)

Distribution of luminous intensity

The following diagrams show polar light intensity curves for lamp base-up orientation

Lumen Maintenance 35W G8.5 3000K

 

100

 

80

% of Initial

60

40

 

20

 

0

0

2

4

6

8

10

12

14

16

Burning time (thousand hours)

Lumen Maintenance 70W G8.5 3000K

 

100

 

80

% of Initial

60

40

 

20

 

0

0

2

4

6

8

10

12

14

16

Burning time (thousand hours)

Lumen Maintenance 35W G8.5 4200K

 

100

 

 

 

 

 

 

 

 

 

95

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Initial

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

85

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

% of

80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

75

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

2

4

6

8

10

12

Burning time (thousand hours)

Lumen Maintenance 70W G8.5 4200K

 

100

 

80

% of Initial

60

40

 

20

 

0

0

2

4

6

8

10

12

14

16

Burning time (thousand hours)

Vertical plane polar intensity curve

 

Imax=170.13 cd at 100º

135˚

150˚

165˚

I (cd)

165˚

150˚

135˚

 

 

 

120

 

 

 

120˚

 

 

90

 

 

120˚

 

 

 

 

 

 

 

 

 

60

 

 

105˚

105˚

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

90˚

 

 

 

 

 

90˚

 

 

 

30

 

 

 

75˚

 

 

60

 

 

75˚

 

 

 

90

 

 

 

60˚

 

 

120

 

 

60˚

45˚

30˚

15˚

0

15˚

30˚

45˚

C180

C270

 

C0

 

C90

 

Vertical plane polar intensity curve

 

Imax=170.13 cd at 100º

225˚

210˚

195˚

180˚

165˚

150˚

135˚

140˚

 

 

160

 

 

 

 

 

120

 

 

120˚

 

 

 

 

 

 

 

 

 

80

 

 

105˚

255˚

 

 

 

 

 

 

 

 

40

 

 

 

270˚

 

 

 

 

 

90˚

 

 

 

40

 

 

 

285˚

 

 

80

 

 

75˚

 

 

 

120

 

 

 

300˚

 

 

160

 

 

60˚

315˚

330˚

305˚

0

15˚

30˚

45˚

 

 

 

 

 

 

I (cd)

C180

C270

 

C0

 

C90

 

6

7

Image 4
Contents Ceramic Metal Halide Lamps Safety warningsSingle Ended G8.5 Product Information Specification summary Dimension Lamp lifeCMH 20W G8.5 3000K CMH 35W G8.5 3000K and 4200KSpecial power distribution Lumen maintenanceDistribution of luminous intensity Lamp end of life conditions Lumen depreciationEnd of life cycling DimmingUV and damage to sensitive materials Information on luminaire designControl gear and accessories DimensionWire cross .75...2.5 mm2 Electronic BallastsImpulser ignitors Superimposed ignitorsOther ignitor related considerations

G8.5 specifications

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