Lighting Cost and Analysis

Similarly, contractor suggested that he can provide you incandscent bulbs for lighting.  However, since incandescent bulbs are notoriously inefficient so you want to replace them with more energy efficient fluorescent bulbs.

Total kWh used in it's lifetime

Incandescent Bulbs

Quantity

Price

Life time of each bulb

Wattage

Kitchen Bathroom Living Room Bedroom 1 Bedroom 2 Bedroom 3

$0.75 each $0.75 each $0.75 each $0.75 each $0.75 each $0.75 each

5 5 5 4 4 4

750 hours 750 hours 750 hours 750 hours 750 hours 750 hours

6000 kWh 6000 kWh 6000 kWh 4800 kWh 4800kWh 4800kWh

100 W 100 W 100 W 100 W 100 W 100 W

Total kWh 32400kWh

Now go to the market and look for price, lifetime and wattage of fluorescent bulbs that gives you approximately same "lumen" as incandescent bulbs.  Fill out your information in the following table.

Total kWh used in it's lifetime

Fluorescent Bulbs

Quantity

Price

Life time of each bulb

Wattage

Kitchen Bathroom Living Room Bedroom 1 Bedroom 2 Bedroom 3

5 5 5 4 4 4

$3.57 each $3.57 each $3.57 each $3.57 each $3.57 each $3.57 each

1320kWh 1320kWh 1320kWh 1056kWh 1056kWh 1056kWh

12,000 hours 12,000 hours 12,000 hours 12,000 hours 12,000 hours 12,000 hours

22 W 22 W 22 W 22 W 22 W 22 W

Total kWh 7128kWh

1  What will be your total energy savings during fluorescent bulbs life time?  32400kWh - 7128kWh = 25272kWh 2.  How much money will be saved?  32400kWh x 0.08$/kw = $2,592 7128kWh x 0.08$/kW = $570.24 therefor $2,592 - $570.24 = $2,021.76 saved