Why did Edison take the credit of inventing a light bulb?

Answer 1

there were three reasons, first, an effective incandescent material, next he was able to achieve a higher vacuum and third a higher resistance lamp that made power distribution from a central source an economical proposition

Answer 2

Edison is often credited with inventing the light bulb because he improved upon existing designs and created a commercially viable product that could be mass-produced and widely adopted. While there were other inventors working on similar technologies around the same time, Edison's contributions were significant in making the light bulb practical for everyday use.