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Flicker Recommendations

Please see below some bullet points for recommendations  in LED lighting regarding flicker according to the document IEEE standard P1789:

  • Compatibility – Dimming behaviour meets or exceeds specified functionality and Reliability of the dimmer and the light source are not affected by combining them. – NEMA SSL-7A

  • Frequency – LED lighting that operates above 120 Hertz are less likely to have a visual flicker effect (detectable by the human eye). The reason to have higher frequency is to avoid the risk of causing seizures to highly sensitive individuals when operating fittings at lower frequencies typically 3 to 70 hz.

  • Minimising flicker – Flicker mainly lies in the driver which can be eliminated by supplying the LED with a constant, non-oscillating  current.

  • Avoid AC-LEDs – Lower priced LED systems commonly use AC-LEDs and due to the simplicity they produce higher levels of flicker even at full output. To avoid flicker always recommend DC-LEDs especially in dimming applications. – ASSIST Recommendations


How to avoid flicker when specifying LEDs:

  • Consult a trained, experienced lighting designer to evaluate your lighting application sensitivity to flicker
  • Consider flicker when specifying products for sensitive applications
  • Ask manufacturers how their product modulates light output 
  • Be aware of system components which can cause flicker (mains dimmable switches and drivers, step-down transformers connected to less than minimum load.)
  • Understand the issue further and stay up to date. 

PhotonStar light engines are optical risk group 0.