Metal Halide Lamp Explosion Proof Lamp
A metal halide lamp is a type of high - intensity discharge (HID) lamp that is widely used for various lighting applications due to its high luminous efficacy and excellent color rendering properties.
Surrounding the arc tube is an outer bulb. This outer bulb plays a crucial dual - role. Firstly, it safeguards the arc tube from the external environment, shielding it from potential damage. Secondly, it significantly reduces the ultraviolet (UV) radiation emitted by the arc tube. The outer bulb can be either clear or coated with a phosphor material. The phosphor coating serves a valuable purpose. It enhances the color quality and luminous efficiency of the lamp by effectively converting a portion of the UV radiation into visible light.
When the lamp is switched on, an initial high - voltage pulse is applied across the electrodes. This pulse serves to ionize the argon gas present within the arc tube. Once the gas becomes ionized, its resistance decreases substantially. As a result, an electric current begins to flow through the arc. This flowing current generates heat, which in turn warms the mercury and metal halide salts, causing them to vaporize. The mercury vapor acts as the main source for conducting electrons. When the metal halide vapor is excited by the electrical discharge, it releases metal atoms. As these excited metal atoms return to their ground state, they emit light at specific wavelengths. The collective emissions from various metal atoms, combined with those from the mercury vapor, give rise to a broad - spectrum light output.
Warm - up and Restrike Time: Metal halide lamps require a certain amount of time to reach their full brightness when first turned on. This warm - up time can range from a few minutes. Also, if the lamp is turned off and then needs to be turned on again immediately, it may not relight until it has cooled down for a period of time, known as the restrike time. This can be a drawback in applications where instant lighting is required.
Sports Lighting: Metal halide lamps are commonly used to illuminate sports fields such as football stadiums, baseball diamonds, and tennis courts. Their high - intensity light output can provide sufficient illumination for athletes to play and for spectators to watch the games.
