Recent Hipparcos results have lent support to the idea that RR Lyrae v
ariables in the halo field and in globular clusters differ in luminosi
ty by approximate to 0.2 mag. In this Letter, we study the pulsation p
roperties of RR Lyrae variables in clusters with distances determined
via main-sequence fitting to Hipparcos parallaxes for field subdwarfs
and compare them with the properties of field variables also analyzed
with Hipparcos. We show that the period-temperature distributions for
field and cluster variables are essentially indistinguishable, thus su
ggesting that there is no significant difference in luminosity between
them.