How does a mercury lamp produce light?
They produce light when electric current passes between two electrodes (also called cathodes) in a tube filled with low-pressure mercury vapor and inert gases, such as argon and krypton. The electric current excites the mercury vapor in the tube, generating radiant energy, primarily in the ultraviolet (UV) range.
Do mercury lights use a lot of electricity?
Compared with newer HID lighting, mercury vapor isn‘t very energy efficient. The “efficacy”—or amount of light produced per unit of electricity consumed—is 20-60 lumens per watt. This is better than incandescent lamps (about 15-20 lumens per watt), but significantly lower than other HID lighting.
Why is mercury a good choice for room lighting?
Bright White Light — Mercury vapor lamps are highly regarded for their ability to produce a very clean white light, especially when compared to earlier lighting options. Long Lamp Life — Generally speaking, mercury vapor lamps will last for at least 24,000 hours, with many lasting even longer.
What happens if you inhale mercury from a light bulb?
Mercury in CFLs are present as elemental (or metallic) mercury. Once inhaled, the mercury vapor can damage the central nervous system, kidneys, and liver. These toxic effects are why any mercury spill should be handled carefully, including one that results from a CFL breaking.
What happens if you get exposed to mercury?
The inhalation of mercury vapour can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested.
What is a main disadvantage of mercury Vapour lamps?
The main drawbacks of high-pressure mercury vapour lamps are their slow 4-7 minute warm-up time, middling energy efficiency (about 50 lumens per watt), and inferior colour rendering compared to metal halide lamps.
How does arc lamp work?
An arc lamp produces light by the sparking (an electrical arc) of a high current between two conducting electrodes, usually carbon rods.
What color is mercury vapor light?
Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. They are very efficient, and provide high-intensity light suitable for illuminating large, open areas.