  We investigate the correlation between the bulge effective radius (r_e) and
disk scale length (r_d), in the near-infrared K band for lenticular galaxies in
the field and in clusters. We find markedly different relations between the two
parameters as a function of luminosity. Lenticulars with total absolute
magnitude fainter than M_T = -24.5 show a positive correlation, in line with
predictions of secular formation processes for the pseudo bulges of late-type
disk galaxies. But brighter lenticulars with M_T < -24.5 show an
anti-correlation, indicating that they formed through a different mechanism.
The available data are insufficient to reliably determine the effect of galaxy
environment on this correlation.
