The standard erythema dose: a new photobiological concept

Editor’s comment: Four colleagues from Europe and North America have written this editorial concerning a newly proposed photobiological term, the standard erythema dose (SED). This editorial is presented to stimulate discussion about what appears to be a more useful measure of erythemogenic ultraviolet radiation. We understand that this proposal is under consideration by the American Society for Photobiology and the European Society for Photobiology.