Energy and Maintenance Savings

Energy Savings:

In today's market, energy cost savings are the number one reason for business owners and facility managers to consider upgrading from inefficient HID type lighting. High intensity discharge fixtures were the fixtures of choice for more than 30 years and still continue to be installed in new construction because architects, specifiers, and end users have either not been aware of the long costs associated with metal halide fixtures or simply were only concerned about the initial fixture costs and not the long term approach to energy and maintenance saving.
Maintenance Savings:
In the long term, induction lamps and ballasts on average will outlast HID's by at least 400% and are considered cheaper to replace.
Comparisons between Induction lighting and LED, Metal Halide and High Pressure Sodium

Comparison

Induction

LED

Technology

Up to 100,000 hours. No electrode or filament will be damaged. Therefore, no maintenance cost & minimizes re-lamping costs.

The first red light LED was developed in 1968. But the first white light LED was in 1996. It’s developing & is one of the hottest light technologies in the market in recent years. But still not technologically mature & problems like sensitive to heat & inconsistent color output have to be solved.

Light Characteristics

Traditional efficacy: 80-90 Lm/W ; Photopic efficacy: 150 pupil lumen/W, CRI: >80Ra, Colour temperature: 2100k – 6500k; easy to control, Light Depreciation: 5% @ 2000hrs, No glare, no flicker, comfortable light source, Disperse, wide light beam

Traditional efficacy: 15-80 Lm/W (Common); 80-100 Lm/W (High Power), CRI > 80Ra, Colour temperature: full range. But strict QC control has to be adopted to guarantee accurate CCT, Light attenuation: 20-30% @ 2000hrs, Serious glare, no flicker, Directional, narrow light beam

Payback Period

For retrofit project, in average 1.7yr. The cost is 1/3 of LED lamps.

Very high cost, in average over 4yrs.

Energy Saving

Replace HID lamps by saving around 50% of the energy

Replace florescent lamps & CFL lamps. Save energy by 30-70% but the cost is 4-5 times higher.

Application

Industrial & commercial buildings, street, tunnel, bridge, garden, advertising board, warehouse, car park, petrol station, supermarket, sports station, swimming pool…

Automotive lights, consumer electronics, traffic signal, mobile phone/PDA/TV display screen, torch, stage lighting. Good for design & signaling purposes. Not recommended for outdoor lightings because of it’s directional light beam, and probably causing blue hazard or blue pollution if without proper shielding

Technical Comparison

  • Power: 15~300W
  • Service Life: >100,000hrs
  • Power factor > 0.98
  • Operation temperature: around 80C
  • Instant on/off & re-strike: yes
  • Dimmable: yes
  • Recycling: very few solid state mercury; easy to recycle & do it only 100,000hr a time
  • Replace-ability: the tube & ballast can bereplaced separately
  • Fixture: lamp is easy to accommodate
  • Excellent temperature tolerance: work properly from -40C to 80C, reliable ignition
  • Wide voltage range: With input voltage fluctuates up to ±10%, output wattage deviates within 3%

  • Each LED bulb provides 0.5~1W. Array of bulbs are needed for large wattage.
  • Service life: >50,000hours
  • Power factor > 0.8-0.95
  • Operating temperature: Over 100C, requires heat sink as a cooling device.
  • Instant on/of & re-strike: yes
  • Dimmable: yes
  • Recycling: no mercury.
  • Replace-ability: the LED bulb & the circuit broad are integrated & are not replaceable.
  • Fixture: Many led bulbs assembled in the same circuit board, it is difficult to design the right reflector & light angle
  • Temperature sensitive: Over-heating will cause light attenuation & shorten the service life
  • Voltage sensitive: voltage drops may lead to high operating current & damage the LED

Comparison

Induction

Metal Halide

High Pressure Sodium

Life Hours

compact 60,000 separated 100,000

6,000-20,000

24,000

Photopic Efficacy

130Plm/W

120Plm/W

90Plm/W

Traditional Efficacy

80 lm/W

75 lm/W

120 lm/W

Lumen Depreciation Rate %

5% over 2,000 hrs

40% over 2,000 hrs

30% over 2,000 hrs

Lamp Operating Temperature

less than 80DegC

higher than 100DecC
increased A/C cost

higher than 100DecC
increased A/C cost

Colour Rendering Index

greater than 80 (Ra)

between 65 and 80 (Ra)

60 (Ra)

Start and Re-strike

Instant

Needs between 5 and 10 minutes

Needs between 5 and 10 minutes

Flicker

None

Yes

Yes

Glare

Less

Serious

Serious

Environmental Safety

Very little mercury, easy to handle No lamp waste in 10 years

Large amount of mercury, special wastage treatment required, Concern with much lamp waste over 10 years

Serious