Usually loud buzz sound could be emitted by inductive ballast, not the lamp itself, because of magnetowstriction vibration of inductor's iron core. Sometimes arc discharge becomes buzzy because of it's instability, at lamp end of life.
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A buzzing noise in a Mercury vapor light may be caused by a loose component, such as the internal ballast or the bulb itself. It could also be due to electrical interference or improper installation of the light fixture. Regular maintenance and ensuring proper wiring connections can help reduce buzzing.
The Transformer in the ballast gets old and dries out and begins to buzz.
When they are new they are very quiet but as they age they start to buzz.
When a common fluorescent lamp is on, the mercury vapor inside is in an excited state. When an electric current passes through the mercury vapor, it excites the mercury atoms, causing them to release ultraviolet light. This ultraviolet light then interacts with the phosphor coating on the inside of the lamp, producing visible light.
A mercury vapor lamp puts out a greater percentage of its energy as light compared to an incandescent lamp. Mercury vapor lamps are more efficient at converting energy into light, whereas incandescent lamps produce more heat than light, making them less energy efficient.
Mercury is the element found in fluorescent light fixtures. It is used in the form of mercury vapor, which produces ultraviolet light when electricity passes through it, causing the phosphor coating inside the tube to fluoresce and produce visible light.
CFLs (compact fluorescent lamps) are made using a glass tube coated with phosphor and filled with a small amount of mercury vapor. When an electric current flows through the tube, it excites the mercury vapor to produce ultraviolet light. The phosphor coating on the tube then converts the ultraviolet light into visible light.
Metal Halide lights are generally brighter than mercury vapor lights. Metal halide lights produce a higher quality and more natural light, making them a popular choice for outdoor lighting in stadiums, parking lots, and other large commercial spaces. Mercury vapor lights tend to have a bluish-green tint and are less bright compared to metal halide lights.