OptionsIncandescentLED lamp Polaroid
Number of Lights 10 10
Power of each lamp 100 W 12 W
Total power of the lamps 1000 W 120 W
The total number of working hours per day/year 100/3650 h 100/36500 h
The total consumption of energy in the day/year 10/3650 kW 1.2/438 kW

Consumption of electricity per year (5.03 rubles per 1 kW
Moscow

18360 rubles. 2203 rubles.
Costs for the purchase of lamps (10 pieces) 200 rubles. 4500 rubles.
Lifetime of lamps 1000 hours 50000 hours
The cost of buying new lamps instead blown for the year 200 rubles. -
Total expenses for the year 18760 rubles. 6703 rubles.
Savings for 1 year - 12057 rubles    
The cost of buying new lamps instead blown over 5 years 1000 rubles. -
Total costs over 5 years 95600 rubles. 11015 rubles.
Savings for 5 years - 84 585 rubles    

* These are approximate, and are taken from the calculation rub.za 5.03 kW/h