I am trying to calculate lighting costs for a new house in Portugal. does anyone know the cost per Kwh? thank you.
if any use to anyone, here are approximate costs of different bulb types at different watts.... at a cost per Kw of .17
I am not an electrician but to the best of my knowledge (and have checked answers with a few energy calculators and seem to be accurate....)
So ONE 50 w halogen bulb
Lighting for 8 hours a day
7 days a week
At a cost of .17kwh (check your electricity tariff)
Costs: €24.75 for the year
If on for the same period of time, One LED: 5w
costs €2.47 for the year - I recently bought them for 7 euros, they last about 10 years.
If on for the same period of time ,An energy saving bulb of 14w, will cost €6.93 for the year. (ie equivalent to 50w halogen)
If on for the same period of time, An energy saving bulb: 23w (equivalent to a normal 100w bulb)
Costs: €11.38 for the year.
If on for the same period of time, An ordinary 100w light bulb:
Costs About €50 euros for the year!! (€49.50)
If you have halogen ceiling lights, you can directly replace the GU10 bulb with an led bulb.