Sign tubes and electrodes
Sign Electrodes
Innovative Arc Tubes Corporation offers high quality sign electrodes for fluorescent and neon tubes for advertising signs.
These signs are made of long, narrow glass tubes, bent into different shapes with an electrode at each end. When high voltage applied between the electrodes, the neon, argon or krypton gas at low pressure inside the glass tube emits light in different colors. Neon emits red light and other gases emit other colors.
Fluorescent tubes
A fluorescent tubes work similarly to neon tubes with two extra steps. There is low pressure mercury vapor inside a fluorescent tube. When electric current is present the mercury vapor emits ultraviolet light. The ultraviolet light is invisible to the human eyes, therefore the inside of a fluorescent tube is coated with a phosphor. Phosphor can accept the energy of ultraviolet photons and emits visible photons.
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