The luminosity of our Sun could be derived by the Stefan-Boltzmann, otherwise known as Luminosity law. It says the total energy produced by a unit surface per unit time area (power per unit area) is: **(power per unit area)=(Stefan-Boltzmann constant)***(Temperature)*^{4}** **That means the luminosity of the Sun is **L=(Surface area of the Sun)****(Stefan-Boltzmann constant)*(Temperature)**^{4}. We are only changing the temperature by a factor **3**. That means the luminosity will increase by a factor of **3**^{4}**,** since the temperature is present in the formula above with its fourth power. Therefore, __the luminosity would increase 81 times__.