| Definition: | discharge tube having cathodes which can be coated with an electron emitting material and which, during the starting process without external heating, emits electrons by field emission Note 1 to entry: Tubular cold-cathode discharge lamps have a low-pressure filling of a rare gas (or a mixture of rare gases) and possibly mercury vapour. Note 2 to entry: Tubular cold-cathode discharge lamps can have an inside coating of fluorescent materials.
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