nonflickering

Nonflickering refers to the absence of visible or perceptible flicker in a light source or display. Flicker is a rapid, repeated fluctuation in brightness, and while often imperceptible at higher frequencies, it can cause discomfort, eye strain, headaches, and in some cases, trigger photosensitive epilepsy. Nonflickering lighting aims to eliminate this phenomenon, providing a more comfortable and visually stable viewing experience.

Various technologies and techniques are employed to achieve nonflickering light. In traditional lighting, this was often achieved by using direct current (DC) or by operating alternating current (AC) lights at frequencies high enough that the human eye cannot detect the on-off cycle. For example, incandescent bulbs have a filament that retains heat and glows for a short period after the current momentarily drops, smoothing out the perceived light. Modern LED lighting systems can achieve nonflickering output through sophisticated driver circuitry that regulates the power supplied to the LEDs. These drivers can use high-frequency pulse-width modulation (PWM) or constant current methods to ensure a consistent light output without perceivable fluctuations.

The importance of nonflickering light is recognized in various fields, including workplace lighting standards, display design for electronic devices, and automotive lighting. Studies have shown that prolonged exposure to flickering light can negatively impact productivity and well-being. Therefore, specifying and verifying nonflickering characteristics is a key consideration in the design and selection of lighting and display technologies.