Abstract—The ERG obtained from albino rats was recorded every 90 sec after the eye was exposed to an adapting white light of known energy. The normalized a‐wave regeneration curves for a constant test stimulus obtained from different rats, using different adapting light energies, were identical and superimposable, except that a delay between the time that the adapting light was turned off and the time that the a‐wave appeared was observed for the high energy adapting light experiments. This delay increased as the adapting light energy incr