A filtered PWM will use an inductor (L) and capacitor (C) to maintain voltage and current in the moments when the PWM cycles off. The other option is to use an LC-filtered PWM. Therefor, dimmer light is dimmer light, strait up. A linear voltage regulator is less efficient as it burns off the excess energy as heat, however it will not result in oscillations in the light intensity as a PWM does. The first is to use a linear voltage regulator rather than a PWM to vary power to the LEDs. You will usually find that the interference patterns get worse with moderate to low frequencies. The dimmer the LEDs are with a PWM, the more time they spend 'off' and the less time they spend 'on'. The brighter the LEDs are with a PWM, the more time they spend 'on' and the less time they spend 'off'. In some cases the frequency of the cycling gets close to the frequency of the rolling shutter, which can cause problems. These days, most LED light systems are controlled by a PWM (pulse width modulation) controller, which cycles power on and off at a relatively fast rate to simulate variable brightness levels. This is usually caused by interference between the frequency at which the light oscillates and the speed of the rolling shutter in the camera. If I understand the question correctly (and I may well NOT be understanding it, in which case apologies for the useless answer! )):

Banding cam