A general analytical solution to one-dimensional minority-carrier transport under illumination in uniformly doped light-trapping (LT) Si solar cells in low-level injection is presented, which is valid for any constant value of propagation angle of internal light, theta. This solution individuates an exact relationship between devices where theta = 0 and devices where theta > 0 degrees. This relationship allows checking the new solution numerically. The numerical check is performed successfully at standard Lambertian optics (theta = 60 degrees) by calculating light-generated currents in a set of Si solar cells. (C) 2016 Elsevier Ltd. All rights reserved.