Users of a commercial light therapy device who were using it to treat migraine were surveyed prospectively to determine what results they obtained after 30 days of daily use. Out of a total of 55 migraineurs, 44% reported that the frequency of their migraine attacks after the treatment was 'Somewhat Less' or 'Much Less' (under a conservative interpretation of these categories). Considering only the 28 migraineurs who stated that their migraine attacks were normally preceded by warning signs, 53% reported that the frequency of their migraine attacks was 'Somewhat Less' or 'Much Less'. In view of the limited efficacy and undesirable side-effects of the available migraine preventive drugs, photic stimulation (flickering light therapy) must be considered a possible preventive treatment for migraine.