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LED PWM Flicker Risk Indicator (IEEE 1789-2015)
LED PWM Flicker Risk Indicator (IEEE 1789-2015)
Estimate the flicker-risk zone for a controller’s PWM output based on frequency and modulation depth, against the IEEE 1789-2015 recommended-practice envelope. Use the result before specifying a controller for healthcare, classroom, or facade installations where flicker is a documented health concern.
System Inputs
IEEE 1789 Risk Assessment
Low Risk
IEEE 1789 zone
8%
Low-risk modulation ceiling
3125×
vs visible flicker (~8 Hz)
+32%
Margin to no-effect ceiling
25 kHz PWM well above the IEEE 1789 high-frequency boundary. No flicker-related health concern at any modulation depth.
No effect: f ≥ 3 kHz
Low risk: 90 – 3000 Hz
High risk: f < 90 Hz
Simplified model based on IEEE 1789-2015 recommended-practice curves. No-effect: PWM frequency ≥ 3000 Hz, no health concern at any modulation depth. Low-risk: 90-3000 Hz with modulation depth ≤ (f / 25) percent. High-risk: f < 90 Hz or modulation above the low-risk ceiling. Healthcare, classroom, and prolonged-viewing installations should target the No-effect band; facade and decorative work tolerate Low-risk if depth is controlled. The full IEEE 1789-2015 standard contains the complete frequency-vs-depth curve and is the authoritative reference.
Need Hardware Assistance?
Want a controller spec’d for a specific IEEE 1789 target zone? Our engineers verify PWM frequency and modulation depth on the factory bench before each batch ships.
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