lsve28Let’s assume that you live in Bulgaria and have 9,5 USD on your account. You can use these money to buy 5 LED Lamps 4W, 1,9 USD each.

 

 

You did not buy LED Lamps

lnak

You did buy LED Lamps

 

lsve28

You have 9,5 USD left on your account

You have 0 USD left on your account

Every day lamps are turned on 6 hours (4 hours in the evening and 2 hours in the morning)

You still use old halogen lamps 40W, so 5 lamps*40W*6hours=1200W=1,2kW per day

Every day lamps are turned on 6 hours (4 hours in the evening and 2 hours in the morning)

You use LED Lamps 4W, so 5 lamps*4W*6hours=120W=0,12kW per day

Each month: 1,2kW*30 days=36kW

Each month: 0,12kW*30 days=3,6kW

Comparing with the other option:

(36kW-3,6kW)*0,11(electricity cost of 1kW/hour in Bulgaria)=3,57 USD –lost profit

Comparing with the other option:

(36kW-3,6kW)*0,11(electricity cost of 1kW/hour)=3,57 USD profit from using LED Lamps

After 3 month: 9,5-(3*3,57)= - 1,21 on your account

After 3 month: (3*3,57)-9,5=1,21 on your account

You’ve lost your saved money!!!

Invested money paid itself and you have your first profit!

You do not have superefficientLED lamps, so you continue to lose money again and again in the form of lost profits.

You still use super efficient LED Lamps and still benefit!

After 1 year: 9,5-(12*3,57)= - 33,34 on your account. You are still losing your money…

After 1 year: (12*3,57)-9,5=33,34 on your account, you are still saving your money!!!

 

But what if you have changed all lamps in your apartment??? And we did not take into account the annual increase in electricity tariffs (5-8% per year on average!!!) And we did not consider the money you will need to spend to replace halogen lamps (as their lifetime is 12-15 times less than lifetime of LED Lamps!!!).