Thanks to the longevity of incandescent bulbs, you'll already save money from your LED purchase. But furthermore, you save mainly due to the low wattage consumption. While a conventional incandescent bulb consumes an average of 75 to 100 watts, LEDs get by with 9 to 13 watts. The lower wattage guarantees less electricity consumption, so you can continue to shine without limitations.
What's more, even the watts used are converted directly into light, not like a conventional bulb. Since a conventional bulb emits much more heat, the energy used by shining it often goes to heat. In the case of LEDs, the electricity is converted directly into light. So with LEDs you only pay for the light, not heat.
If you're reluctant about the higher price of LED bulbs, there's no need to worry. The initial cost will be recouped in the first year of use and you will save up to 200 EUR per year thanks to LEDs.