@werper57,
You really can't compute this without knowing a lot about the room the bulb is in, but if you want to take a stab at computing an answer, you could use the Stefan"Boltzmann equation for black body radiation
Power = epsilon x Area x T^4
Epsilon is the Stefan"Boltzmann constant 5.670 ?-10??'8 W·m??'2·K??'4
You have to guess the surface area of the bulb. I'd assume a 0.025m radius and assume it is a sphere. That makes the surface area around .00785 m^2
60 W = (5.67x10-8 W·m??'2·K??'4) * .00785 * T^4
T = 605 degrees K