Flicker refers to the rapid, repeated variations in light output, often caused by fluctuations in voltage or electrical power supply. The effect may vary depending on several factors, such as the quality of the light source, the type of driver, and the stability of the electrical connection.

Although more common in older lighting technologies like incandescent and fluorescent lamps, flicker can also occur in modern LED lighting. Some individuals are particularly sensitive to flickering, experiencing varying effects that range from mild discomfort to more serious health implications.

Tips for Minimizing Light Flicker

Ensuring stable, flicker-free lighting contributes to a more comfortable and healthier environment. Here are some effective strategies:

• Invest in High-Quality Light Sources: Using quality lighting products from trusted manufacturers reduces the likelihood of flicker. Lower-quality light sources are more prone to visible flickering.
• Choose Fixtures with High Flicker Frequency: Aim for fixtures that operate at a flicker frequency of at least 90 Hz to minimize perceptible flicker.
• Avoid Electrical Line Overloads: Avoid placing heavy variable-load electrical devices on the same circuit as LED lights, as this can increase voltage fluctuations and contribute to flicker.
• Use Compatible Dimmer Switches: If you prefer dimmable lighting, ensure compatibility between the dimmer switch and LED fixtures, as incompatibility may lead to flickering.
• Consult a Professional: An experienced electrician can assess your lighting system and implement measures to reduce flicker if needed.

Perception of Flicker in Lighting

Our ability to detect flicker depends largely on its frequency. Typically, flicker frequencies above 50 Hz become imperceptible to the human eye. However, even at imperceptible frequencies, flicker can still have subtle physiological effects.

The human eye can generally perceive flicker at frequencies up to 50 Hz, with heightened sensitivity between 10 and 25 Hz. Flicker beyond 50 Hz often appears as a steady light, but this continuous exposure to fluctuating light can still cause visual fatigue.

Flicker and LED Technology

LED technology uses drivers to convert high-voltage alternating current (AC) to low-voltage direct current (DC). When these drivers are of lower quality, interference from AC power may transfer to the LED, leading to flicker.

Using lighting solutions with high-quality, flicker-free drivers or LEDs with less than 5% flicker rate can help reduce these issues, enhancing comfort and well-being.

Health Effects of Light Flicker

Even if flicker is not consciously perceived, our sensory system still detects these rapid light fluctuations, which can accumulate over time and lead to visual discomfort. Physiologically, this exposure can lead to eye strain and headaches, particularly in prolonged work settings.

These issues first became prominent with the widespread use of fluorescent lighting, leading to eye strain complaints. Advances like electronic ballasts reduced flicker and improved comfort, but even with today’s LED technology, flicker remains a consideration. Reducing flicker wherever possible can create a more comfortable and productive environment.

By prioritizing high-quality, flicker-free lighting, we can create spaces that not only enhance visual clarity but also support overall well-being—a core commitment in UMAYA Lighting’s approach to innovative and human-centered lighting design.