APPLIANCES AND EQUIPMENT
Application Examples of Energy-efficient Lighting Systems
1. Comparison of Capital Cost and Electricity Cost Among Different Lamps Used at Home
(A) Lamp Bulb 1.2
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| Incandescent Bulb | Compact Fluorescent Lamp | LED Lamp | |
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| Wattage (W) | 60 | 12 | 7 |
| Lumen Output (lm) | 710 | 700 | 600 |
| Luminous Efficacy (lm/W) | 12 | 58 | 86 |
| Average Life Expectancy (hrs.) | 1,000 | 8,000 | 15,000 |
| Annual Electricity Consumption for Each Bulb (kWh) 1.3 | 131 | 26 | 15 |
| Annual Electricity Cost for Each Bulb 1.4 | HK$158 | HK$32 | HK$18 |
| Retail Price for Each Bulb | HK$18 | HK$40 | HK$52 |
| Number of Bulb Required for Operating 15,000 Hours (No.) | 15 | 2 | 1 |
| Total Capital Cost and Electricity Cost for Operating 15,000 Hours | HK$1,350 | HK$291 | HK$178 |
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Remarks:
(1.1) The information above refers to a product catalogue 2016
(1.2) The lamp base for the lamps are E27
(1.3) According to the market survey, the average operating hours for lighting in each family is 6 hours per day
(1.4) Assume 1 electricity unit (kWh) costs HK$1.2
(B) Decorative Lamp 2.2
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| Halogen Lamp | LED Lamp | ||
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| Wattage (W) | 50 | 5.5 | |
| Centre Beam Luminous Intensity (cd) | 1200 | 1030 | |
| Average Life Expectancy (hrs.) | 2,000 | 25,000 | |
| Annual Electricity Consumption for Each Lamp (kWh) 2.3 | 110 | 12 | |
| Annual Electricity Cost for Each Lamp 2.4 | HK$131 | HK$14 | |
| Retail Price for Each Lamp | HK$10 | HK$102 | |
| Number of Lamp Required for Operating 25,000 Hours (No.) | 13 | 1 | |
| Total Capital Cost and Electricity Cost for Operating 25,000 Hours | HK$1,625 | HK$267 | |
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Remarks:
(2.1) The information above refers to a product catalogue 2016
(2.2) The lamp type is MR16. Lamp base is GU5.3 and beam angle is 36°
(2.3) According to the market survey, the average operating hours for lighting in each family is 6 hours per day
(2.4) Assume 1 electricity unit (kWh) costs HK$1.2
2. T5 Lighting Project at Arsenal House
- The project involved replacement of 320 sets 3x18W T8 luminaires (with magnetic ballasts) with new 3x14W T5 luminaires at 27/F
- New luminaire complete with 3x14W electronic ballast & double parabolic reflectors designed to CIBSE LG3 Cat.II
Lighting Layout at 27/F, Arsenal House
Luminaire installed in this project (old 3x18W T8 luminaire, left; new 3x14W T5 luminaire, right)
Summary Table of the T5 Lighting Retrofit
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| Existing T8 Lighting System | New T5 Lighting System | % change | |
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| Active Power | 28 kW | 16 kW | -42% |
| Power Factor | 0.53 | 0.99 | + 87% |
| THD | 11% | 8.6% | -21.8% |
| Apparent Power | 52.8 kVA | 16.2 kVA | -69% |
| Ave. Illuminance | 450 lux | 600 lux | +33% |
| Lighting Power Density | 30 W/m2 | 18 W/m2 | -40% |
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The new lighting system consumes less power with improved efficiency and average illuminance.
2x80W High Output T5 Lighting System at Kowloon Bay Indoor Games Hall (Existing HID Lighting)
- New Design of 2x80W High Output T5 Lighting System at Kowloon Bay Indoor Games Hall (KBIGH) to suit various functions:
- Lighting Class I: 750 lux for top-level competition & training at international & national standard
- Lighting Class II: 500 lux for mid-level competition or high-level training at regional level
- Lighting Class III: 300 lux for low-level competition, general training & recreation activities, etc.
Comparison of visual environment between existing HID and new High Output T5 Lighting System at Kowloon Bay Indoor Games Hall
Lighting Control using Digital Addressable Lighting Interface (DALI)
The new system allows switching group and different scenes setting controlled by computer in a simple, push-buttons mode.