HID vs Fluorescents

No. Lamps

1

4

6

6

Service Life

20,000 hours @ 10 hours/start

24,000 hours @ 10 hours/start

24,000 hours @ 10 hours/start

28,000 hours @ 10 hours/start

Initial Lamp Light Output

36,000 lumens

20,000 lumens

30,000 lumens

18,600 lumens

Ballast

Probe-start magnetic

Program start

Program start

Instant start

Ballast Factor

1.0

1.0

1.0

1.18

Initial System Light Output

36,000 lumens

20,000 lumens

30,000 lumens

21,948 lumens

Lamp Watts

400W

216W

324W

192W

System Watts

458W

234W

351W

222W

Relative System Watts

100%

51%

77%

48%

Initial System Efficacy

79 lm/W

85 lm/W

85 lm/W

99 lm/W

Mean Lumens

23,500 lumens @ 40% of lamp life

19,000 lumens @ 40% of lamp life

28,500 lumens @ 40% of lamp life

20,851 lumens @ 40% of lamp life

Lumen Maintenance

65%

95%

95%

95%

Relative Maintained Light Output

100%

81%

121%

89%

Maintained System Efficacy

51 lm/W

81 lm/W

81 lm/W

94 lm/W

Color Rendering

65 CRI

82-85 CRI

82-85 CRI

85 CRI

Starting Time

4 minutes

<1.5 seconds

<1.5 seconds

<1 second

Re-strike Time

10 minutes

<1.5 seconds

<1.5 seconds

<1 second

Color Temperature

3000-4000K

3000-5000K

3000-5000K

3000-5000K