  We derive the frequency of occurrence of luminous long period variables
(LLPVs) in globular clusters and in the Baade's Window field of the Galactic
bulge. LLPVs occur only in clusters with [Fe/H]>/= -1.0. In these clusters
their frequency of occurrence relative to the number of giant stars appears to
be independent of metallicity. Integrated over all metallicities, Baade's
Window appears to be deficient in LLPVs. We estimate [Fe/H] values for Baade's
Window LLPVs from their period and a log P vs. [Fe/H] relation derived from
cluster variables and find that LLPVs with [Fe/H]>/= 0.0 are absent from
Baade's Window. We propose that this is because of enhanced mass loss rates in
these LLPVs with a consequently abbreviated lifetime compared to lower
metallicity LLPVs. A typical lifetime for cluster LLPVs is about 3 x10^5 yrs.
Finally, we call attention to the need for a much more complete survey for
LLPVs in globular clusters.
