Two varieties of such lamps exist.
Low pressure sodium lamps disadvantages.
Designing with lps see also lps costs low pressure sodium like all lighting types has its own pecularities advantages and disadvantages some of these are discussed in these links.
The efficacy of low wattage white hps lamps is lower than that of metal halide lamps lumens per watt of low wattage metal halide is 75 85 while white hps is 50 60 lpw.
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Philips 234047 18 watt t15 sox e18 low pressure sodium hid light bulb.
Fluorescent bulbs up types of lighting.
Types of lighting.
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 lps and high pressure hps these lamps are mostly used for street lighting as well as industrial uses.
Low pressure sodium lamp is a kind of low pressure sodium vapor discharge tube inner tube with special anti sodium glass blown and can radiate 5890a 5896a sodium line can be used as a monochromatic light source optical polarimeter refractometer polarization instrument in.
Lps light provides essentially no color rendition so is inappropriate for any use where 1 color perception is important and 2 lps will be the only light source illuminating the area.
Sodium lamps were first produced commercially by philips in holland in 1932.