heat of light bulb

Well, the conversion rate from W to °C is around 0.56.

The luminous efficiency of a 100 W bulb is around 2.6% which means that 97.4% is dissipated heat.

The result is that the temperature at the filament is around 175 °C.

Now you have to report that temperature all over the bulb's surface, which you have to calculate..

When the power is off, it's generally room temperature.

Do you mean at its surface Rvf and forgive me but why do you need to know this