Phase 4 flashes symbols at ≈70 ms (≈14 Hz).
Photosensitive-seizure susceptibility peaks at 15–25 Hz, with a broader susceptible range of 1–65 Hz (Fisher, Harding et al., Epilepsy Foundation of America Working Group, Epilepsia 46(9), 2005). The ITU-R BT.1702 standard identifies flash rates above 3 Hz and the 10–30 Hz region as primary concerns.
Proceed only if you have no history of seizures or photosensitivity, and you are alone in a dim, distraction-free room.
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