it is so because, all the photons are not used in emitting light..the probabilty of radiative photons should be more so that we can get enough radiations in form of laser.actually some of the photons are absorbed in the material for the recombination of electron hole pairs.thus they do not emit...
hey i think u should use mesh analysis for solving this circuuit. consider separate currents I1 and I2 for the two loops.now apply kirchhoffs voltage law in both the loops sepreately.solve for I1 and I2.
the value of I1 will give u the current at point A.