  Decay form factors of $B$ to light pseudoscalar ($P$) and vector ($V$) mesons
are analyzed with the momentum cutoff near end point. The cutoff is caused by
possible Cherenkov gluon radiation when an energetic light parton from the weak
vertex travels through the ''brown muck'' of light degrees of freedom. The
end-point singularities and the double countings are naturally absent. The
soft-overlap contributions where the partonic momenta configuration is highly
asymmetric are very suppressed in this framework. A simple calculation gives a
plausible results for $B\to P,V$ form factors.
