  A lattice calculation of the form factors that determine the ``hadronization
ratios'', such as $R_{K^*}$ and $R_{\phi}$, where $R_{K^*} \equiv [\Gamma ($B
\to K^* \gamma$)/\Gamma(b \to s \gamma)]$, is presented in the quenched
approximation. Lattice data shows strong evidence for the scaling law suggested
by heavy quark symmetry for one of the form factors ({\it i.e.}\ $T_2$). The
data also gives strong support for the simple pole ansatz for the $q^2$
dependence of $T_2$ in the range of available $q^2$. We thus find $T_2(0) = .10
\pm.01\pm.03$ yielding $R_{K^*} =(6.0\pm1.2\pm3.4)\%$; we also find
$R_{\phi}=(6.6\pm1.3\pm3.7)\%$.
