When neon is injected into a tokamak plasma with the aim of reducing the peak heat flow into the SOL by enhanced edge radiation, both P~ and Zef f increase. The ratio of the incremental Praa to the incremental Zeff, APrad/AZeff, can change on TEXTOR from 0. l MW to about 2 MW depending on n e, on Te(a) and on the transport regime. The measured m Prad/Z~Zeff is higher for I-mode auxiliary heated (higher diffusion) than for OH discharges (lower diffusion), consistent with model calculations. For I-mode discharges A PraJAZeff is a decreasing function of Te(a) and it scales approximately as -z The I-mode regime on TEXTOR, which displays very good energy confinement scaling, can represent, for suitable conditions, a satisfactory compromise between a high r E and not excessive particle confinement.