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I show that a flow structure where wide jets hit a slower expanding shellmight be very efficient in channelling the kinetic energy of the jets toradiation, therefore accounting for, at a least a fraction of, intermediateluminosity optical transients (ILOTs) where the total radiation energy is muchlarger than what recombination energy of the outflow can supply. This type offlow might occur in the frame of the high-accretion-powered ILOT (HAPI) model,where there is a high mass accretion rate as a result of stellar merger or masstransfer in a binary system. I derive the condition on the jets half-openingangle for the jets not to penetrate through the slow shell, as well as theratio of the photon diffusion time to expansion time. This ratio cannot be toolarge if a large fraction of the thermal energy is channelled to radiation. Iapply the jet-powered radiation model to the Great Eruption of Eta Carinae, toV838~Mon, and to V4332~Sgr, and find a plausible set of parameters for theseILOTs. I expect the jet-powered radiation model to be more efficient inconverting kinetic energy to radiation than ILOT models that are based onequatorial mass concentration. In many cases, thought, I expect both jets andequatorial mass concentration to occur in the same system.

Efficiently jet-powered radiation in intermediate-luminosity optical transients (ILOTS)