Life Expectancy High Pressure Sodium Lamp

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.

Life expectancy high pressure sodium lamp.

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 pressure sodium light bulbs are different. Vivosun 1 pack 1000 watt high pressure sodium hps grow light bulb lamp high par enhanced red and orange spectrums cct 2100k ultra bright 140 000 lumens 4 4 out of 5 stars 267 28 99 28. Standard lumalux standard lumalux lamps are known for high efficacy long life and reliability.

The high pressure lights produce a more desirable golden to white light. Louden schmidt and homonnay. 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. The first lamp with 400 w 42000 initial lumens and 6000 hour life first came in the market in 1965.

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. This means the horizontal rated life is only 75 of the vertical lamp rated life for these 100w mh lamps. When the light bulb begins cycling this means that the bulb has reached its life expectancy and needs to be changed. The life time should be based on the whole lamp life.

Two varieties of such lamps exist. High pressure sodium lights have a better color rendition than low pressure sodium lights. Lamps are avail able from 35 to 150 watts in medium base and 50 to 1000. 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.

Basic operation in a high pressure sodium lamp a compact arc tube contains a mixture of xenon sodium and mercury. 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. 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. High pressure sodium hps lamps are not sensitive to burning position.

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. The lamp is an improvement over the lps lamp in that it has more acceptable color with the great efficiency of the sodium lamp.