IEC 60155: Glow Starters for Fluorescent Lamps — The Ingenious Thermo-Mechanical-Electrical Design

Glow Starters for Fluorescent Lamps: The Flickering Cylinder Has Its Own IEC Standard

IEC 60155 specifies glow starters for fluorescent lamps. That small flickering cylinder in legacy fluorescent fixtures contains a bimetallic strip and argon gas — precisely switching between filament preheating and high-voltage pulse generation.

How it works: Power on → argon glow discharge heats the bimetallic strip → strip bends, closing contacts → current preheats filaments (1–2 s) → glow extinguishes, bimetal cools → contacts snap open → ballast inductance generates 800–1,500 V pulse → strikes mercury vapor in the tube → lamp lights. If the lamp fails to strike, the starter automatically retries — explaining the characteristic “few flickers then on” behavior.

Key parameters: Pulse voltage ≥800 V (guaranteed strike), pulse repetition rate (prevents lamp damage), and non-reclosure voltage — once the lamp is lit (tube voltage drop ~100 V), the starter contacts must not reclose, otherwise the lamp extinguishes and restarts (the dreaded “flickering” failure mode).

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