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Emphasising the advantages of switching to LED lighting


Trinity College Dublin

Introduction

Everyday, we turn on lights in our places of work and study and sometimes, we turn them off.

In our homes we have direct ownership of the electricity bill which encourages us to save electricity. This means making sure the lights are turned off when not in use and switching the lighting to more efficient technology like LED lights.

In our places of work and study we don’t pay for the electricity so does it matter turning off lighting or do we care what sort of lighting is used.

You will be surprised!!!!

uni-eco

LED Savings Calculator

Number of Bulbs
Original Bulb Wattage
Replacement Bulb Wattage
Hours of Use Per Day
Days of Use Per Week
Weeks of Use per Year

Other Benefits:

The overall lighting would be improved making the environment more comfortable and safer.
Lamp life could also be improved by 30% which reduces bulb waste and reduces the amount of service calls to facilities for bulb maintenance.

School of Physics - Mechanical Workshop Case Study

The School of Physics “Mechanical Workshop” reduced 0.65 metric tons of carbon dioxide per year by switching from fluorescent bulbs to LED Lighting. This lighting replacement saved an estimated €832 per annum on TCD’s Electricity costs. Overall lighting of the workshop was improved making the environment more comfortable and safer. Lamp life was doubled which reduces the amount of service calls to E&F for bulb replacements and reduces bulb waste.

  • A typical airline flight from Dublin to New York emits approx. 0.65 metric tons of carbon dioxide per trip
  • A typical passenger vehicle in Ireland emits approx. 4.6 metric tons of carbon dioxide per year
  • A typical Irish home has a carbon footprint of approx. 11 tonnes, which is one of the highest in Europe

Analysis of switching from Fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

58

57

Number of Lamps

36

18

Lamp Life (hrs)

15000

50000

Hours ON per Day

10

10

Electricity Cost per Day *1

€6.26

€3.07

Days used per Year (Normally)       

261

261

Cost per Year *1

€1633

€801

Savings per Year *1

€832

Percent Saving

51%

Emissions reduction *2

654Kg of CO2 per Year

* *1 Estimated cost of unit of electricity = €0.30 / kWh
*2 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh

Case studies (5 potential savings analysis)

School of Engineering - Museum Building Lobby

The Museum Building Lobby has a potential to reduce 250 Kg’s of carbon emissions per year by switching from fluorescent bulbs to LED Lighting.

If this lighting was replaced, it would save an estimated €208 per annum on TCD’s Electricity costs
The overall lighting would be improved making the environment more comfortable and safer.
Lamp life could be improved by 50% which reduces the amount of service calls to E&F for bulb replacements and reduces bulb waste.

Facts:
A typical airline flight from Dublin to New York emits approx. 650 Kg’s of carbon dioxide per trip

A typical passenger vehicle in Ireland emits approx. 4.6 metric tons of carbon dioxide per year

A typical Irish home has a carbon footprint of approx. 11 tonnes, which is one of the highest in Europe

 

 

Analysis of switching from fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

20

12

Number of Lamps

14

14

Lamp Life (hrs)

20000

30000

Hours ON per Day

24

24

Electricity Cost per Day

€2.01

€1.21

Days used per Year (Normally)       

365

365

Cost per Year

€735.84

€441.50

Savings per Year     

€294.34

Percent Saving

40%

Emissions reduction *

233Kg of CO2 per Year

*3 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh

* Estimated cost of unit of electricity = €0.30 / kWh

School of Chemistry - SNIAM Teaching Lab

The School of Chemistry “SNIAM Teaching Lab” has a potential to reduce 3.2 metric tons of carbon emissions per year by switching from fluorescent bulbs to LED Lighting.

If this lighting was replaced, it would save an estimated €4033 per annum on TCD’s Electricity costs
The overall lighting would be improved making the environment more comfortable and safer.
Lamp life could be doubled reducing the amount of service calls to E&F for bulb replacements and reduces bulb waste.

Facts:
A typical airline flight from Dublin to New York emits approx. 0.65 metric tons of carbon dioxide per trip

A typical passenger vehicle in Ireland emits approx. 4.6 metric tons of carbon dioxide per year

A typical Irish home has a carbon footprint of approx. 11 tonnes, which is one of the highest in Europe

 

 

Analysis of the potentials of switching from fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

36

18.9

Number of Lamps

194

97

Lamp Life (hrs)

15000

50000

Hours ON per Day

10

10

Electricity Cost per Day *1

€20.95

€5.50

Days used per Year (Normally)       

261

261

Cost per Year *1

€5468

€1435

Savings per Year *1  

€4033

Percent Saving

73%

Emissions reduction *2

3.1 tons of CO2 per Year

*1 Estimated cost of unit of electricity = €0.30 / kWh
*2 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh

School of Physics Lobby, Corridors & Halls

The School of Physics “SNIAM Building’s” has a potential to reduce 12.1 metric tons of carbon dioxide per year by switching from fluorescent bulbs to LED Lighting in the Lobby, Corridors & Halls.

If this lighting was replaced, it would save an estimated €16262 per annum on TCD’s Electricity costs
The overall lighting would be improved making the environment more comfortable and safer.

Lamp life will be improved which reduces the amount of service calls to E&F for bulb replacements and reduces bulb waste.

 

 

Analysis of the potentials of switching from Fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

26

9

Number of Lamps

364

364

Lamp Life (hrs)

13000

30000

Hours ON per Day

24

24

Electricity Cost per Day *1

€68

€23

Days used per Year (Normally)       

365

365

Cost per Year *1

€24871

€8609

Savings per Year *1  

€16262

Percent Saving

65%

Emissions reduction *2

12.8 tons of CO2 per Year

*1 Estimated cost of unit of electricity = €0.30 / kWh

*2 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh

School of Physics UG Teaching Labs

The School of Physics “UG Teaching Labs” has a potential to reduce 3.63 metric tons of carbon dioxide per year by switching from fluorescent bulbs to LED Lighting.

If this lighting was replaced, it would save an estimated €4616 per annum on TCD’s Electricity costs.
Potentially, the overall lighting would be improved by 18% making the environment more comfortable and safer.
Lamp life could be doubled reducing the amount of service calls to E&F for bulb replacements and reduces bulb waste.

Using the manufactures specifications and the amount of time the lights are on in the workshop, the estimated lifetime of the LED lights is 19 years (Ideally).

 

 

Analysis of the potentials of switching from Fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

36

18.9

Number of Lamps

222

111

Lamp Life (hrs)

15000

50000

Hours ON per Day

10

10

Electricity Cost per Day *1

€23.98

€6.29

Days used per Year (Normally)       

261

261

Cost per Year *1

€6258

€1642

Savings per Year *1  

€4616

Percent Saving

73%

Emissions reduction *2

3.63 tons of CO2 per Year

*1 Estimated cost of unit of electricity = €0.30 / kWh
*2 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh

School of Physics Standard Single Office

A School of Physics Standard Single occupancy Office has a potential to reduce 51 Kg’s of carbon dioxide per year by switching from fluorescent bulbs to LED Lighting.

If this lighting was replaced, it would save an estimated €64 per annum on TCD’s Electricity costs.
The overall lighting would be improved making the environment more comfortable and safer.
Lamp life could be doubled reducing the amount of service calls to E&F for bulb replacements and reduces bulb waste.

Facts:
A typical airline flight from Dublin to New York emits approx. 650 Kg’s of carbon dioxide per trip

A typical passenger vehicle in Ireland emits approx. 4.6 metric tons of carbon dioxide per year

A typical Irish home has a carbon footprint of approx. 11 tonnes, which is one of the highest in Europe

 

 

Analysis of the potentials of switching from fluorescent bulbs to LED Lighting

 

Existing Bulb/Lamp

LED Replacement

Wattage (W)

36

18.9

Number of Lamps

4

2

Lamp Life (hrs)

15000

50000

Hours ON per Day

10

10

Electricity Cost per Day *1

€0.43

€0.11

Days used per Year (Normally)       

200

200

Cost per Year *1

€86

€22

Savings per Year *1  

€64

Percent Saving

74%

Emissions reduction *2

50 Kgs of CO2 per Year

*1 Estimated cost of unit of electricity = €0.30 / kWh

*2 2020 Average All-Island CO2 emission for electricity 236 gCO2/kWh