High Pressure Mercury Vapour Lamp

A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.

High pressure mercury vapour lamp.

Mercury lamps get dimmer over time and rarely burn out so it is wise to replace them and restore light level. The clear mercury bulb has a bluish green appearance and the deluxe white has a higher color rendering. Later cooper hewitt mercury vapor tubes and historic fixture. This phosphor technology offers better color rendition than the more efficient high or low pressure sodium vapor lamps but still falls short of metal halide and ceramic metal halide sources.

While many applications are ideal for mercury vapor lamps they are being challenged by the higher efficiency and better color balance of metal halide. Again transition of the electrons requires least amount of input energy from a colliding electron. High pressure mercury vapor arc lamps a type of high intensity discharge lamps are operated with a pressure of the order of one atmosphere and with much increased power densities so that more mercury is evaporated the high density of the vapor allows for light emission with a much higher radiance. As the main arc strikes and the gas heats up and increases in pressure the light shifts into the visible range and the high gas pressure causes.

1906 higher pressure mercury vapor light in a fuzed quartz tube is developed kuch retschinsky siemens munich 1936 the modern high pressure mercury vapor lamp is developed type mb. The lamp is an improvement over the lps lamp in that it has more acceptable color with the great efficiency of the sodium lamp. In such lamps there is also much stronger spectral broadening. Low pressure and high pressure low pressure sodium lamps are highly efficient electrical light sources but their yellow light restricts applications to outdoor lighting such as street lamps where they are widely used.

High and low pressure uv mercury vapour lamps heraeus manufactures low and high pressure mercury vapour lamps used for applications such as photochemical processing fluorimetry mercury analysers medical and environmental equipment and fixed wavelength detectors. As pressure increases the chance of multiple collisions gets increased. Mercury vapor lamps feature low initial cost but have higher operating costs than hps or metal halide due to its lower efficiency. Two varieties of such lamps exist.

The uv irradiation power can be as high as approximately 30 of the nominal power. High pressure sodium lamp hps lamp the hps lamp is the most ubiquitous lamp for street lighting on the planet. The arc then heats up the mercury and the mercury vapor then lights giving the lamp a bluish color.