Light flicker meter
Measures modulation depth and frequency of a light source, the optical counterpart to dirty-electricity measurements and the metric behind LED comfort complaints.
optical modulation
Last verified 12 August 2026.
Also searched as: flicker tester, percent flicker meter
- Band covered
- optical modulation
- Quantities measured
- frequency
- Typical price
- $40–$600
Detects
- Percent flicker and flicker index of lamps and screens
- Driver quality differences between lamps
Cannot detect
- Any electromagnetic field quantity — this measures light, not EMF
What to insist on
- Reports percent flicker and frequency, not a pass/fail light
- Sample rate high enough for kilohertz PWM dimming
Related records
- LED lamps and low-cost drivers
The switch-mode driver inside a cheap LED lamp can put measurable high-frequency harmonics on the circuit and produce visible flicker; well-filtered drivers do neither.
Sources & emitters
Sources
- sbm-2024 Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024) — Institut für Baubiologie + Nachhaltigkeit (IBN), 2024. ngo, link checked 2026-08-12.
Same record, other formats