Re:Eye Strain from LED Backlighting in MacBook Pro (2008)
by Zak on Saturday January 06, 2018 @06:47PM
(#16088165)
A lot of cheap mains-powered LEDs aren't using PWM, but running on mains power directly.
You can test whether this is the case using a smartphone camera and an app with manual shutter speed control. If you see scanlines just above and below, but not at 1/50s, your light source is flickering at 50 Hz, which is the AC frequency of UK mains power.
You can test whether this is the case using a smartphone camera and an app with manual shutter speed control. If you see scanlines just above and below, but not at 1/50s, your light source is flickering at 50 Hz, which is the AC frequency of UK mains power.