The color exhibited is due to the color of the gaseous element inside

 The color exhibited is due to the color of the gaseous element inside

the bulb. Each gas element known to science glows with a specific color

when ionized. Argon created the blue and green bulbs; neon created

the coral, yellow, and orchid bulbs. The inside of the bulb is coated with

colored phosphors. The type of gas used inside was matched as closely as

possible to the color of the phosphors in the white coating. (The green is

bright because green phosphor is the brightest member if the chemical

family and red phosphor is the dimmest. A standard 4-foot fluorescent

tube in green is three to five times brighter than a red one of the same size.)

The ions created by the glowing gas bombard the phosphor coating, caus-

ing it to fluoresce or glow. This is the definition of a fluorescent source.

The hue can be varied somewhat by changing the pressure and/or varying

the current e electrodes, and gases can be alloyed in various proportions

to provide color combinations not available w4th single gases.

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