The document discusses the significant potential for electricity savings in buildings by retrofitting traditional lightbulbs with LED lights, which consume far less energy. A case study on a dormitory section shows that changing to LED bulbs can dramatically reduce both electricity consumption and costs, resulting in a payback period of approximately six months. Overall, the transition to LED lighting is presented as an economically viable solution for energy conservation and cost reduction.

1. LEDS LIGHTBULBS IN BUILDINGS
“SAVE ELECTRICITY, PAY LESS”
By: Akhtar Zeb
Email: akhtarzeb88@gmail.com
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2. CONTENTS
 Objectives
 Lighting electricity consumption in buildings
 Electrical consumption before retrofitting- A
case study of dormitory section in IMOP building
 LEDs light bulb
 After retrofitting
 Results
 Conclusions
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3. OBJECTIVES
 To highlight current lighting electricity
consumption in buildings
 To decrease electricity consumption in buildings
 To estimate the required investment
 To calculate the Payback period
 To calculate monthly electricity saving using
LEDs light bulbs
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4. LIGHTING IN BUILDINGS – ELECTRICAL
CONSUMPTION
 Lighting represents almost 20% of global
electricity consumption
 This consumption is similar to the amount of
electricity generated by nuclear power
 The latest IEA estimates show the total savings
potential in residential and services lighting at
more than 2.4 EJ per year by 2030
Source: International Energy Agency 4

5. CURRENT SCENARIO –
DORMITORY SECTION, IMOP BUILDING
Apartment
Number of
lamps
Watt Total Wattage
Bedroom 1 4 60 240
Bedroom 2 4 60 240
Kitchen 2 50 100
Toilet 1 50 50
Shower 2 50 100
Total current power requirement of an apartment 730 W
Assumptions
Bedrooms: 8h/day
Kitchen: 16h/day
Toilet & bathroom: 4 h/day
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6. Current electricity consumption and monthly &
annual bill of an apartment
 Electricity consumption per day: 6.04 KWh
 Total consumption per month: 181.2 KWh
 Monthly electricity bill: 543.6 rubles (1 KWh = 3
ruble)
 Annual electricity bill: 6523.2 rubles
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7. LEDS LIGHTS
 Three of the most common energy-efficient
lighting types include halogen incandescents,
CFLs, and LEDs
 Traditional incandescent bulbs use a lot of energy to produce light
 90% of the energy is given off as heat
 That lost energy is money we are throwing away
 LEDs use only 20%–25% of the energy and last up to 25 times
longer than the traditional incandescent bulbs they replace
 LEDs use 25%–30% of the energy and last 8 to 25 times
longer than halogen incandescent
 The LED lamps have very high efficiency
 It acts as an environmental light source from manufacturing to
disposal
Source: www.mrs.680 org,
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8. LEDS VS. OTHER LIGHTBULBS
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9. AFTER RETROFITTING
Apartment
Number of
lamps
Watt Total Wattage
Bedroom 1 4 10 40
Bedroom 2 4 10 40
Kitchen 2 6 12
Toilet 1 6 6
Shower 2 6 12
After Retrofitting the total power requirement of an apartment 110 W
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10. After retrofitting, electricity consumption and
monthly bill of an apartment
 Electricity consumption per day: 0.904 KWh
 Total consumption per month: 27.12 KWh
 Monthly electricity bill: 81.36 rubles (1 KWh = 3
ruble)
 Annual electricity bill: 976.32 rubles
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11. RESULTS – FOR 100 APARTMENTS
 Total investment for changing lamps: 273,000
ruble (1 bulb, 210 ruble; 1300*210= 273,000)
 Annual Economy by reducing electricity bill:
6523.2*100 - 976.32*100 = 554,688 ruble
 Payback period: 273,000/554,700 = 0.49 years =
6 months
 Amount of electricity saving per month: 181.2*100
- 27.12*100 = 154* 100 = 15,408 KWh
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12. CONCLUSIONS
Replacing the present traditional lights by LED
lights in our buildings would result in;
 lower electricity bills
 energy conservation
Furthermore,
 the process is quite feasible and economically
viable.
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13. THANK YOU
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