Wellness · Flicker-Free Dimming
The light above your head is flickering.
You just can't see it.
A deep dive into the science, technology, and health effects behind flicker — and how Colorbeam eliminates it entirely.
Explore the Colorbeam wellness pillars | HCL & Circadian Lighting · Ultra-Low EMF
What it is
Flicker — the invisible problem in most homes
Most people have experienced eye strain, a dull headache, or a vague sense of fatigue in a room and attributed it to screen time, a long day, or poor sleep. Rarely does anyone think to blame the lights. But for a significant portion of the population, the lighting itself — specifically the imperceptible flickering produced by conventional dimmers — is a meaningful contributor to exactly these symptoms.
Flicker occurs when the light output of a bulb or fixture fluctuates rapidly over time. In conventional dimming systems, this happens as a byproduct of how the dimmer reduces power — by switching the current on and off many times per second. At higher frequencies this switching becomes invisible to the conscious eye. But invisible does not mean undetected. The visual system and nervous system continue to register it, and over extended exposure, the cumulative effect is real.
Research distinguishes between two categories of flicker effects. Visible flicker — below approximately 70 Hz — produces overt symptoms including headaches, dizziness, and nausea. Invisible flicker — above the visible threshold but still present — produces subtler effects that accumulate over time: eye strain, fatigue, headache, migraine triggering, and difficulty concentrating. Emerging research suggests that 66 to 74% of people are affected by light flicker and screen-related eye strain, even if they don't identify flicker as the cause of their discomfort.
Colorbeam eliminates flicker entirely through a combination of advanced dimming technology and precise control protocols. The sections below explain exactly how.
The Technology
Why conventional lighting flickers — and why Colorbeam doesn't
Understanding why Colorbeam is flicker-free requires understanding why conventional lighting flickers in the first place — and what it takes to engineer a system that genuinely eliminates it.
Layer 01 · The Problem
Conventional dimming — and the flicker it produces
Conventional residential lighting runs on alternating current — AC power. AC current reverses direction many times per second, typically at 60 Hz in North America. When a conventional dimmer reduces light output, it does so by rapidly switching the light output many times per second — delivering less total power to the fixture through a technique called pulse-width modulation, or PWM dimming.
The result is a light source that is literally switching on and off many times per second. At full brightness the switching is fast enough that persistence of vision makes it appear continuous. As the dimmer reduces output the switching pattern changes, and at certain dim levels the flicker becomes more pronounced — sometimes crossing into visible territory, often remaining just below the threshold of conscious perception while still being registered by the visual system and nervous system.
This is not a flaw of a particular product or brand. Both AC and DC lighting systems are prone to flicker if not dimmed using the right combination of technology and control protocols. Most conventional systems are not. The question is how much flicker is produced, at what frequencies, and whether the system was engineered to address it.
Layer 02 · The Solution
Advanced dimming technology — flicker eliminated at the source
Colorbeam achieves flicker-free dimming to 0.1% — the lowest dim level available in architectural lighting — through a combination of advanced dimming technology and precise control protocols engineered specifically to eliminate flicker at every brightness level. This level of smoothness isn't something conventional lighting systems can replicate, not because of a single feature, but because of how the entire system is designed to work together.
The result is light that dims as a smooth, continuous reduction at every level. No stepping, no sudden shifts, no cycling. At any brightness from full output to the dimmest setting, the light is stable and the visual system has nothing to register, the nervous system has nothing to accumulate.
This isn't an add-on feature. It is a consequence of the system being designed — from the infrastructure to the control layer — with this standard of performance as a requirement. The same integrated approach that delivers this dimming precision is also what enables the EMF reduction and the circadian precision of the HEKA chipset. The three wellness pillars are not separate products. They share the same foundation.
What changes
How flicker-free lighting changes daily life
The improvement is noticed as an absence. People stay in spaces longer, their eyes feel better at the end of the day, and they experience a general sense of comfort in the space that they often can't articulate until it's explained. Here is what that looks like in practice.
The Science
The research behind this page
Three peer-reviewed sources directly support the content on this page. Each includes a plain-language summary and a direct link to the full paper.
Ready to go further
Experience the difference for yourself
Every Colorbeam installation is custom designed — and flicker-free at every dim level, in every room, by design