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We present a new analysis of the ionizing emissivity ($\dot{N}_{\rm{ion}}$,s$^{-1}$ Mpc$^{-3}$) for galaxies during the epoch of reionization and theirpotential for completing and maintaining reionization. We use extensive SEDmodelling -- incorporating two plausible mechanisms for the escape of Lymancontinuum photon -- to explore the range and evolution of ionizing efficienciesconsistent with new results on galaxy colours ($\beta$) during this epoch. Weestimate $\dot{N}_{\rm{ion}}$ for the latest observations of the luminosity andstar-formation rate density at $z<10$, outlining the range of emissivityhistories consistent with our new model. Given the growing observationalevidence for a UV colour-magnitude relation in high-redshift galaxies, we findthat for any plausible evolution in galaxy properties, red (brighter) galaxiesare less efficient at producing ionizing photons than their blue (fainter)counterparts. The assumption of a redshift and luminosity evolution in $\beta$leads to two important conclusions. Firstly, the ionizing efficiency ofgalaxies naturally increases with redshift. Secondly, for a luminositydependent ionizing efficiency, we find that galaxies down to a rest-framemagnitude of $M_{\rm{UV}} \approx -15$ alone can potentially produce sufficientnumbers of ionizing photons to maintain reionization as early as $z\sim8$ for aclumping factor of $C_{\rm{H {\small II}}} \leq 3$.

Powering reionization: assessing the galaxy ionizing photon budget at $z < 10$