Within the framework of the nonadiabatic model developed earlier, a semiempirical analysis is performed of experimental data available in the literature for the radiative lifetimes of rovibronic levels of the I¹ Π_g- and J¹Δ_g states of the H₂ molecule, and the most reliable results are selected, from which absolute values of the adiabatic dipole moments of the 3d¹Π_g → 2p¹σ_u ⁺ , 3d¹Π_g → 2p¹Π_u, and 3d¹Π_g → 2p¹Π_u electronic transitions in the hydrogen molecule are obtained. In this analysis, information was used on relative values of the dipole moments obtained in our earlier analysis of the rotational and vibrational branching ratios for transitions from these levels to rovibronic levels of the C¹Π_u and B¹σ_u states. It is established that the absolute values of dipole moments of the 3d¹Π_g → 2p¹Π_u and 3d¹Δ → 2p¹Π_u transitions obtained in this work are smaller in magnitude by 20-30% than the results of ab initia calculations in the region of internuclear separations r - 1.6-2.8 au. For the 3d¹Π_g → 2p¹σ_u ⁺ transition, these data coincide in the vicinity of r = 2 au; however, the r-dependence found by the semiempirical analysis is approximately twice as strong as that resulting from nonempirical calculations.