  We suggest a method to determine V_ub / V_ts through a comparison of B -> X_u
l nu_l and B -> X_s gamma. The relevant quantity is the spectrum of the
light-cone component of the final state hadronic momentum, which in B -> X_s
gamma is the photon energy while in B -> X_u l nu_l this requires a measurement
of both hadronic energy and hadronic invariant mass. The non-perturbative
contributions at tree level to these distributions are identical and may be
cancelled by taking the ratio of the spectra. Radiative corrections to this
comparison are discussed to order alpha_s and are combined with the
non-perturbative contributions.
