Generally it's a phosphorous compound.
The long thin light bulb is called a fluorescent tube or a fluorescent light bulb. It is commonly used in commercial buildings, offices, and schools for general lighting purposes.
The swirly light bulb is called a compact fluorescent lamp (CFL). It is a type of energy-efficient light bulb that produces light by using electricity to excite the gas inside the bulb to create illumination.
No, the inner wall of a fluorescent bulb is typically coated with a phosphor powder, not with potassium. The phosphor coating absorbs the ultraviolet light emitted by the mercury vapor in the bulb and converts it into visible light.
Fluorescent light bulbs have an inner wall coated with phosphor powder. This coating converts the ultraviolet light produced by the bulb into visible light when it strikes the phosphor.
They are called CFL light bulbs. CFL stands for Compact Fluorescent Light .
fluorescent bulbs have mercury in them. There are heaters at the ends of the bulb that vaporizes the mercury to allow the light to be produced ( the fluorescence on the inside of the bulb is what actually glows). If the bulb is cold you do not get the ionization of the mercury to cause the fluorescent powder inside the bulb to glow, or it just glows a small amount.
EEdmund Germer (90% sure) made the first fluorescent light bulb
The curly light bulb is called a compact fluorescent lamp (CFL). It is designed to be more energy-efficient than traditional incandescent light bulbs.
Florescent light-bulbs CFL Compact Fluorescent Lamp
The energy saving light-bulbs are usually fluorescent. Neon is a type of fluorescent light bulb.
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To accurately measure the brightness of a fluorescent bulb, you can use a light meter or a lux meter. These devices measure the amount of light emitted by the bulb in units called lux. Place the meter close to the bulb and take a reading to determine its brightness.