The amount of light that reaches the Earth's surface depends on several factors, including the distance from the sun, the angle at which sunlight hits the surface, and the presence of clouds and other particles in the atmosphere.

On a clear day, the amount of light reaching the Earth's surface is approximately 1,000 watts per square meter. This value can vary depending on the time of day and the location on the planet. For example, the amount of light is higher at noon compared to early morning or evening, and it is also higher in regions closer to the equator compared to higher latitudes.

Clouds and other particles in the atmosphere can reduce the amount of light reaching the Earth's surface. Clouds can block sunlight directly, and particles such as dust and aerosols can scatter sunlight, causing it to be less intense. The amount of reduction depends on the density of the clouds or particles.

Overall, the amount of light on the Earth's surface varies depending on various factors, but on a clear day, it is approximately 1,000 watts per square meter.