It is found that the amount of Ly alpha radiation escaping from the galaxies strongly depends on the time over which the dust is produced through stellar activity, and on the ambient inhomogeneity of the HII regions that surround the ionizing OB stars.
Good agreement is found with recent observations, as well as previous non-detections.
It is predicted that future observations can detect these Ly alpha galaxies upto redshifts of the order of 8.