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.
Life expectancy high pressure sodium lamp.
High pressure sodium lamps may be used in open luminaires except for item 67527 lu400t7 rsc and sox low pressure sodium which must be operated in an enclosed fixture.
High pressure sodium light bulbs are different.
Two varieties of such lamps exist.
High pressure sodium hps lamps are not sensitive to burning position.
Their chemistry changes over time so that a typical high pressure sodium light bulb begins turning off and on or cycling at 24 000 hours.
In 1959 the development of polycrystalline alumina pca opened a new path to introduce the high pressure sodium vapor lamp as this material is very rarely affected by high pressure and temperature sodium vapor.
Due to their high efficiency and long life today s hps lamps are also suitable for many interior applications particularly where color rendering is not a crucial concern.
In the 1980s ge engineers further improved the lamp life and efficiency.
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.
The lamp is an improvement over the lps lamp in that it has more acceptable color with the great efficiency of the sodium lamp.
High pressure lights have a life expectancy of 16 000 to 24 000 hours lps low pressure sodium lights produce the greatest amount of light per watt of energy consumed.
The high pressure lights produce a more desirable golden to white light.
Hps include lighting electrical accessories mainly hps ballasts ignitors and lamps sodium lamps average life expectancy for 3 to 5 years energy saving ballasts not less than 20 years the lighting as well the led lamp life no experience with existing enterprise known as the 50000 60000 hours there is no reliable basis.
This means the horizontal rated life is only 75 of the vertical lamp rated life for these 100w mh lamps.
High pressure sodium lamp hps lamp the hps lamp is the most ubiquitous lamp for street lighting on the planet.
High pressure sodium lights have a better color rendition than low pressure sodium lights.
When the light bulb begins cycling this means that the bulb has reached its life expectancy and needs to be changed.
The first lamp with 400 w 42000 initial lumens and 6000 hour life first came in the market in 1965.
From the general electric 1999 lamp catalogue p 3 15 the rated life is 24 000 hours which means that at 24 000 hours the testing ended with two thirds of the lamps.
The life time should be based on the whole lamp life.
Lamps are avail able from 35 to 150 watts in medium base and 50 to 1000.
Basic operation in a high pressure sodium lamp a compact arc tube contains a mixture of xenon sodium and mercury.
