![]() ![]() PWM dimming is actually just a controlled "flickering" of the LED strip between "on" and "off" states. If one understands the principle behind LED strip dimming and PWM, the issue of flicker should become obviously apparent. By increasing or decreasing the ratio of "on" vs "off" time during each cycle, brightness can be increased or decreased, respectively. ![]() The perceived effect is a lowered brightness, since the LEDs are no longer emitting light during the entirety of each of these cycle durations. PWM works by "blinking" the LEDs at a rapid rate, such that it cycles through "on" and "off" states many times per second. Why does an LED strip dimmer create flicker?Īlmost all LED strip dimmers operate using an electronics principle known as Pulse Width Modulation (PWM for short). It is therefore absolutely critical that a flicker-free LED strip dimmer is used when lighting a scene for photography or cinematography. Not all dimmers are created equal, however, and will cause problems related to flickering when used for film and photography. In other words, being able to control brightness and color temperature or hue on the fly is now almost a minimum requirement for photographers and lighting technicians.ĭimming an LED strip is almost always accomplished by a dimmer (DMX or analog) that is typically installed between the power supply and LED strip. Matching variable ambient lighting conditions and unpredictable DP orders can mean that the ability to dynamically control LED strips on-scene is critical. With just a 12V or 24V power supply, you can get an LED strip light system up and running very quickly.īut today's photography and cinematography professionals look for more than just a fixed, color-correct / high CRI LED strip product. ![]() LED strips are a new and versatile light source that has been gaining quick adoption in the film and photography lighting industry. ![]()
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