The origin of optical emission in a fine‐tube fluorescent lamp is verified. The diffusion of plasma generated at a high voltage electrode, causes a radiation before Townsend discharge. At the normal glow, the propagation of electron plasma wave causes the light emission.

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The lamp length 0.6∼2.0 m of external electrode fluorescent lamps for the backlight of LCD‐TVs has been investigated with respect to the lamp property, such as the current and voltage, the luminance and efficiency, and the luminance uniformity along the tube.