Light

Is my LED lamp flickering, and what does the EU rule say?

Short answer

Possibly. The EU limits flicker (Pst LM ≤ 1.0) and, more strictly since 1 September 2024, the stroboscopic effect (SVM ≤ 0.4), both at full load.

Explanation

LEDs can fluctuate quickly in brightness. Visible flicker and the stroboscopic effect on moving objects are measured separately. The ecodesign regulation has set limits for mains lamps since 1 September 2021. For the stroboscopic effect the limit was first SVM ≤ 0.9; since 1 September 2024 it is SVM ≤ 0.4. The limits apply at full load; when dimmed, things can be different.

Rules of thumb

• These limits have applied since 1 September 2021. [SW-S01]
• Check the product sheet for Pst LM (limit 1.0) and SVM (limit 0.4 since 1 September 2024). [SW-S73]
• Use a dimmer that the lamp manufacturer lists as compatible. (practical tip, not a source value)

Pitfalls

• The limits apply at full load; a cheap dimmer can cause flicker when dimmed. [SW-S01]

Search terms

These search terms are in Dutch; only terms that also find a topic in English are links.

flikkering stroboscopisch effect dimmer SVM Pst

Read also

• What is CRI or Ra, and which value should I choose?
• Do smart bulbs use power when they are off?

Sources

1. SW-S01 Verordening (EU) 2019/2020 — ecologisch ontwerp lichtbronnen — Europese Commissie (EUR-Lex) (Reference date 2026-09-27)
2. SW-S73 Verordening (EU) 2019/2020 — geconsolideerde tekst (met wijziging 2021/341) — Europese Commissie (EUR-Lex) (Reference date 2026-09-27)

Reference date: 2026-09-27 · Translated with AI from the Dutch original.