  We report search results for the flavor-changing neutral current process b
--> d gamma with a data sample containing 274 million B meson pairs accumulated
at the Upsilon(4S) resonance with the Belle detector at KEKB. We studied the
exclusive decays B- --> rho- gamma, B0bar --> rho0 gamma, and B0bar --> omega
gamma, and find no significant signal. We set an upper limit for a combined
branching fraction Br(B --> (rho,omega) gamma) < 1.4 x 10-6 at the 90%
confidence level, which is normalized to that of B- --> rho- gamma assuming an
isospin relation between the three modes.
