What flicker really means — and why we test every driver
Not all flicker is visible — but it still affects light quality. In LED lighting, flicker refers to rapid fluctuations in brightness. You may occasionally notice it as a shimmer or subtle pulse, especially while dimming. However, most flicker happens at high frequency and goes unnoticed. Even so, it can still lead to discomfort, eye fatigue, or reduced concentration over time.
How Karizma Luce approaches flicker testing
At Karizma Luce, we test every driver type before approving it for use. For luminaires like Dea Eros S TU-in, we evaluate flicker behaviour under real-world conditions. This includes testing across all dimming levels, colour temperatures, and realistic load scenarios. Our in-house lab uses calibrated sensors and high-speed equipment to ensure visual stability — not just at full power, but throughout the entire dimming curve.
Which metrics are used in flicker testing?
We assess flicker using two well-known metrics:
- Percent flicker – shows how much the light output varies within one cycle
- Flicker index – a unitless value (0–1) that reflects both amplitude and waveform shape
Here is how you can interpret the results:
| Flicker Level | Percent Flicker | Flicker Index | Recommendation |
|---|
| Very low | 0–1% | 0.00–0.01 | Imperceptible; ideal for all applications |
| Low | 1–5% | 0.01–0.05 | Excellent for interiors and hospitality |
| Medium | 5–10% | 0.05–0.10 | Acceptable in indirect or functional zones |
| High | 10%+ | 0.10+ | Avoid in living areas or visual tasks |
What about European standards?
In addition to flicker index and percent flicker, we also check advanced metrics like PstLM and sVM. These are part of European norms such as IEC TR 61547-1 and EN 61000-3-3. While not always included in datasheets, these values help ensure safety and comfort — especially in architectural or professional environments.
You can read more about PstLM and sVM in the Dea Eros S ME-in DID YOU KNOW section.
Requesting a flicker report
If your project requires documented performance, we can provide a detailed flicker report on request. This includes sVM, PstLM, percent flicker, and flicker index — all measured on the exact configuration you specify. Simply reach out via our Contact page and we’ll assist you.
With Dea Eros S TU-in, you’re not just selecting a luminaire with excellent design. You’re also choosing a system with verified comfort and silent performance — at every dimming level, in every detail.
