  We present spectra of nine low-luminosity early-type galaxies (M_B > -17.5)
in the Coma cluster. The spectra, which were obtained with the Multiple Mirror
Telescope and cover the spectral region 3300-5350 A, exhibit a large variation
in Balmer line strengths. In fact the line strength variation among the Coma
low-luminosity galaxies is as large as that found among a sample of
low-luminosity ellipticals in the Virgo cluster and lower density environments.
When compared to detailed population synthesis models, the variation in Balmer
line strengths among the Coma galaxies indicates a range in luminosity-weighted
mean age of from 1 Gyr to 12 Gyr. The two youngest galaxies are shown to be in
a post-starburst state, i.e., they are not simply former spirals whose star
formation was recently terminated. Moreover, the 1 Gyr ages of these two
youngest low-luminosity galaxies are similar to those of the brighter
post-starburst galaxies in Coma.
