New high power amalgam lamps are significantly more powerful than low pressure lamps. The sodium is mixed with other impurities to create a more white light.
The mercury helps add a blue spectrum light to the pure yellow of the sodium.
High pressure mercury vapour lamp spectrum. 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. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates uv light to excite the phosphors.
High pressure mercury vapor and some specially designed metal halide lamps find application in molecular spectroscopy due to providing useful broadband continuum noise energy at millimeter and terahertz wavelengths owing to the high electron temperature of the arc plasma. 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. 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.
Mercury lamps get dimmer over time and rarely burn out so it is wise to replace them and restore light level. When use with the heraus c430 power supply the line output is much higher than and the stability comparable to that of a deuterium lamp. These are small lights such as christmas.
The mercury vapor lamp is a high intensity discharge lamp. The sodium vapor strikes an arc over 240 c. Low pressure sodium lamps.
Two varieties of such lamps exist. Mercury vapor lamps feature low initial cost but have higher operating costs than hps or metal halide due to its lower efficiency. At low pressures the output is predominantly in the ultra violet but as pressure increases self absorption here results in the visible green yellow and violet lines becoming relatively stronger.
These lamps are expensive to maintain. Led light emitting diodes. Medium pressure lamps produce the greatest uv output per unit length of lamp of the 3 lamp types.
They are gaseous produce 150 lumens per watt have a life of about 15 000 hours and are even more efficient than high pressure sodium. They also cause less light pollution then mercury vapor lamps. Above about one atmosphere pressure a very small amount of continuum radiation begins to enter the spectrum and this progressively increases in strength as pressure.
The spectral power distribution of the mercury discharge depends to a very great extent on the pressure at which it is operating. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it s own arc. Even though more cleaning may be required for medium and amalgam lamp based systems because they have a smaller number of lamps in the uv unit these systems can.
The main uv emission line of ionized mercury 254 nm correlates to a blackbody of t 11 500 k. This lamp has a highly stable output predominantly at the 253 7 nm mercury line. The lamp heats and the sodium is the last material to vaporize.
The clear mercury bulb has a bluish green appearance and the deluxe white has a higher color rendering. Other lines which total 20 of the output are at 313 nm 365 nm 404 nm and 435 nm.