[المتفيزق]

first of all, i'm sorry i'll not solve this completely for i 'm afraid it 's a take home exam or some sort of homeworks...

however;
in the laser beam..
you are given the energy flow (power)... and the spot area ...just divide the power by the area when you have the intensity(or power per unit area)

now for the lamp you have the radius( 2.5 m) so that the surface area of the sphere is 4pi r2 ...
from above (the laser beam) you have calculated the intensity and then you equate : intensity of laser= intensity of lamp = power / surface area.