Induction vs Metal Halide - LightingRetroFit Victoria

INDUCTION vs METAL HALIDE

General Comparison 

Comparison

Induction

Metal Halide

Life Hours

60,000 - 100,000

10,000 - 20,000

Re-strike

Instant

5~15 minutes

Lamp Operating Temperature

<80�F
Reduces A/C cost

>300� F
Increased A/C cost

Colour Render Index (Ra)

Approx. 80

Approx. 75

Colour Temperature (K)

3000 - 6500

3000 - 5000

Flicker

No

Yes

Glare

No

Yes

Luminance Comparison

Light Source

Conventional
lumens per watt

Total lumens (Lm)

Correction
Factor
(P/S ratio)

Pupil Lumens
per watt (Plm/w)

Initial Total (Plm)

40W Induction

70

2,800

1.96

115

4,600

70W Metal halide

80

4,800

1.49

116

7,150

150W Induction

82

12,300

1.96

157

24,110

250W Metal halide

80

20,000

1.49

116

29,080

250W Induction

82

20,500

1.96

161

40,180

400W Metal halide

80

32,000

1.49

119

47,680

Lumen Maintenance Factor Comparison

Light Source

Initial Total (Plm/w)

Lumen Depre rate at 2,000 hr (%)

Total at 2,000 hr (Plm/w)

Lumen Depre rate at 8000 hr (%)

Total at 8,000 hr (Plm/w) ave

Lumen Depre rate at 16,000 hr (%)

Total at 16,000 hr (Plm/w) ave

40W Induction

4,600

3

4,462

5

4,370

10

4,140

70W Metal Halide

7,150

20

5,720

30-40

4,648

40-60

3,575

150W Induction

24,110

3

23,387

5

22,905

10

21,700

250W Metal Halide

29,080

20

23,264

30-40

18,902

40-60

14,540

250W Induction

40,180

3

38,975

5

38,171

10

36,162

400W Metal Halide

47,680

20

38,144

30-40

30,992

40-60

23,840

Notes

  • A light working 24/7 in a factory runs for 8,760 hours per year.
  • Mean lumens and mean pupil lumens is defined as the number of lumens produced at 40 to 50 percent of rated lamp life.
  • LightingRetroFit tables are based on matching as closely as possible, the Plm/w, between Metal Halide globes and Induction globes when the Metal Halide globe is in its 'mean lumen' range. This figure is calculated using the S/P ratio formula (refer to our industry information pages). We consider this to be the emerging international standard in lighting design.
  • High quality Metal Halide globes can be rated as high as 20,000 hours (5 changes per Induction globe life). Lesser quality, cheaper globes may be rated as low as 8,000 hours (12 changes per Induction globe life). Download and use our cost savings charts to quantify your long term re-lamping and maintenance costs and potential savings.
  • When considering changes to facility lighting one should consider whether the existing lighting is adequate for the current use in different areas of the plant. Refitting with LightingRetrofit parts allows the client to increase, decrease or change the colour temperature (K) of their current lighting levels in line with their actual lighting requirements.
  • The lighting maintenance level for induction lighting beyond 16,000 hours remains steady in a range from 90% depleting down to around 80% beyond 80,000 hours.
  • A major Metal Halide globe producer describes 'economic life' as a better measure of globe performance as the lamp 'rated life' tests fail to take into account the lumen depreciation and colour shift that occurs as lamps age. They write that the 'economic life' of a Metal Halide lamp is between 60% & 75% of the rated life.
  • Typically a new Metal Halide globe and ballast would cost from $60-120 depending on quality.

Comparisoan