LED lamps and possible flicker Explanations and measurement results.

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Presentation transcript:

LED lamps and possible flicker Explanations and measurement results

LED lamps flicker - init Article NP in 2009, headaches and led lighting Fast (100 Hz) variations of light intensity?  Due to power supply/driver  varying output What to measure – no norms?

Measurement setup Photo diode Amplifier Fast, up to 5000 Hz

Measurement parameter Fast variations in illuminance Look for parameter Modulation index in %

Measurement results 22% 9% 22% 37% TL + VSA

Measurement results 100% 33% 0% 0% 12V AC 12V DC Not led but power supply issue

Easy test When high modulation depth  stroboscopic effect. Left 0, right 0.55

Flicker overview Fast (100 Hz) variations of light intensity Due to power supply/driver  varying output Modulation depth =top-top / 2*average Can lead to headaches When > ? %

Flicker at lamps investigation Study Fluorescent lighting, headaches and eyestrain from 1989 Fluorescent tubes+choke ballast (45 %) vs tubes + electronic ballast (7 %) Exchange of tubes unknown Double blind study

Flicker at lamps investigation Amount of eyestrain and nr of headaches were monitored New light significantly less initial and after change into More natural light (higher levels in building) less headaches

Flicker results Try to be below 30 – % Prof 80 % Consumer 80 % Consumer

Flicker overview Fast (100 Hz) variations of light intensity Due to power supply/driver  varying output Modulation depth =top-top / 2*average Can lead to headaches When > 35 %

Articles on OliNo.org Flickering: flickering-of-light-bulbs flickering-of-light-bulbs knipperen-van-lampen knipperen-van-lampen knipperen-van-lampen-wat-is-toelaatbaar knipperen-van-lampen-wat-is-toelaatbaar