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The process gamma gamma -> l+ l- is highly suppressed when the total angularmomentum of the two colliding photons is zero so that it cannot be used forluminosity determination. This configuration, however is needed for Higgsproduction at a photon collider. It will be shown that the process gamma gamma-> l+ l- gamma can be used in this case to measure the luminosity of a colliderwith a precision that is good enough not to limit the error on the partialdecay width Gamma(H -> gamma gamma).Comment: Final version, accepted by journa

Measuring the luminosity of a γ γ collider with $\ensuremath\gamma \gamma \rightarrow \ell^+ \ell^- \gamma$ events