LEDs use pulse width modulation to dim, so if it&#x27;s a subpar circuit with relatively large width duty cycle, that might be what you&#x27;re picking up. Might want to check out persistence of vision displays. They rely on tricking your brain in similar ways.<p>Do florescent lights bother you too at all?<p>Also from what I&#x27;ve heard sometimes people will only see visuals after a second time taking LSD or by taking a more substantial sized dose.