Name :   Christina Galindo-Walsh Organization :   National Disability Rights Network Post Date :   9/30/2005 Section Comments Section :   2.2.7.4.1 Page no. :   2-39 Line no.:   10-15 Comment :   Comments/Recommendation:   The language of this section stating that no display screen of a voting station shall flicker with a frequency between 2 Hz and 55 Hz Is consistent with the recommended flash rate of 1 Hz to 3 Hz for persons with epilepsy. However, the language should be modified to make clear that a flash rate that exceeds 55 Hz is unacceptable and potentially very dangerous for persons with epilepsy.   In addition, even if the flash rate of a display screen is within the recommended range for persons with epilepsy, it can still trigger a photo-convulsive response(seizure) if there are multiple, unsynchronized display screens (or other visual alarms) within a single space. Two or more of these types of fixtures under these conditions could generate a combined flash rate that is outside the   recommended parameters. Limiting the number of these types of fixtures, decreasing the flash rate, or synchronizing the flash rates of multiple fixtures within a single space can prevent this from occurring.   To increase the overall effectiveness of the display screens, the maximum pulse duration should be two-tenths of one second (0.2 seconds) with a maximum duty cycle of 40 percent. The intensity of the light should be no less 75 candela.