why can light from the sun cause skin cancer but the light from a light bulb cannot cause skin cancer?

uv light damages the skin over a long period of time

Explanation:

Some sunlight can be good as long as you have proper protection from overexposure. But too much ultraviolet, or UV, exposure can cause sunburn. The UV rays penetrate outer skin layers and hit the deeper layers of the skin, where they can damage or kill skin

UV radiation damages DNA in your skin cells, which can accumulate over time and increase the risk of genetic mutations that cause skin cancer. The more often you get burnt, the more damage is done and the higher the risk of skin cancer.

Explanation:

compass can be used day and night, cloudy or sunny