High Pressure Sodium Lamp End Of Life

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.

High pressure sodium lamp end of life. Everest fernandez 31 400 views. At end of life high pressure sodium hps lamps exhibit a phenomenon known as cycling caused by a loss of sodium in the arc. The products are sodium oxide and aluminum. A big driver behind their use is their.

Basic operation in a high pressure sodium lamp a compact arc tube contains a mixture of xenon sodium and mercury. Sodium is a highly reactive element and is lost in a reaction with the aluminum oxide of the arc tube. As they heat up during operation however the internal gas pressure within the arc tube rises and a higher voltage is required to maintain the arc discharge. These lamps are used for gen eral lighting applications where high efficiency and long life are desired but color is not critical.

A bulb s estimated yearly cost is based on 3 hours of usage per day at 0. Any cri value over 80 will show colors true to life. It is often difficult to determine when a patient may have a life expectancy of six months or less. When it nears end of life as in the case of your lamp reactions with the lamp s alumina synthetic sapphire really shell have depleted much of the sodium from the lamp raising the voltage required to maintain the discharge to a point where when the lamp is fully hot the ballast can no longer provide that voltage causing the lamp to extinguish and re strike when it cools down.

They are to be viewed as guidelines and not mandated criteria. These lamps can be started at a relatively low voltage. How often should you replace high pressure sodium and metal halide grow lamps. This is a result of the lamp requiring more voltage from the ballast to stabilize and operate than the ballast can provide thus the lamps cycle off and on.

We provide the following guidelines to assist you in determining if your patient is appropriate for hospice care. At the end of life many types of high intensity discharge lamps exhibit a phenomenon known as cycling. 6 na al 2 o 3 3 na 2 o 2 al. High pressure sodium lamps tend to cycle off and on at the end of life.

They are commonly used in public parking lots roadways and other security areas.