Flicker-free lighting: why it matters in architectural spaces

Architectural lighting is usually judged on appearance, function and energy use. The steadiness of the light matters as much. Flicker affects comfort, and it shows up on camera long before most people notice it by eye.

What flicker is

Flicker is a rapid, repeated change in the brightness of a light source. LED and fluorescent lighting rely on electronics to regulate current. When that regulation is poor, light output ripples with the mains supply: at 100 Hz on India's 50 Hz network.

• Visible flicker can be seen and is distracting. It is typical of older or poorly designed products.
• Invisible flicker is too fast to see directly, but it can still affect comfort and shows up as strobing around moving objects.

Why it matters

• Comfort and wellbeing: long exposure to flickering light can contribute to eye strain, fatigue and headaches, especially for people who are sensitive to light.
• Concentration: unsteady light makes long periods of reading and screen work more tiring.
• Photography and video: flicker causes banding and strobing in photographs and video, which matters wherever spaces and products are filmed.

Where it matters most

Offices and schools, where people work under artificial light for hours; homes, especially where people read and work; and stores and hospitality spaces, where visual comfort shapes how long people stay and how products and interiors look on camera.

What to ask for in a specification

• The driver and dimming method for the exact luminaire and configuration: flicker depends on both.
• Flicker performance at the dimming levels you will actually use, not only at full output.
• Measured values or test references for the configuration offered.

When you share a brief, tell us where visual comfort or filming matters, and we will cover the driver and dimming approach in our proposal.