The 25" & 27" HP CW/er/es/XW series monitors are not advertised as being Flicker Free even though they do not use LED PWM Dimming (
read about the side effects), regardless of high or low the brightness is set. LED PWM Dimming was tested for using the Blur Busters Test UFO Blur Trail/PWM Test from 0-100% Brightness. The lack of PWM is a good thing since PWM or Flicker ruins motion clarity (
example), and makes some people suffer from health issues such as headaches, and/or eyestrain.