Here is an infographics from the website lamps.com, featuring the cost of using incandescent light bulbs, CFL bulbs (comact fluorescent bulbs) or LEDs.
The average lifespan of a led is 50 times longer than an incandescent light bulbs. Price is also significantly higher, even nif LEDs are getting cheaper
However, we have to bear in mind that incandescent light bulbs are less used than in the past. In the USA, incandescent light bulbs are disappearing In 2014. In Europe too, incandescent light bulbs are being phased out. By switching to compact fluorescent bulbs, companies and industries can reduce their negative contribution to climate change and save money at the same time.
The initial higher cost is quickly recovered, as these bulbs use only a quarter or a fifth of the electricity used by incandescent bulbs, and last much longer. Over its lifetime, a single compact fluorescent bulb will save you approximately 250 $, and their price is decreasing.