Check the porcelain holder for any signs of deep cracks or breaks.
What does a high pressure sodium bulb look like.
Sodium mercury and xenon are usually used inside the arc tube.
Most high pressure sodium light systems normally last between 12 000 to 24 000 hours.
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The most common problem with a high pressure sodium light is the bulb.
Observe the interior gas tube for any signs of discoloration.
Two varieties of such lamps exist.
If the tube is black the bulb is definitely burned out.
The first course of action is to simply change the bulb.
The arc tube has a high pressure inside for higher 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.
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Both bulbs have a relatively long lifespan though a high pressure sodium bulb will last slightly longer up to 6 to 18 months at a usage rate of 12 hours per day 2 to 6 5 thousand hours total while a metal halide bulb will last for 6 to 12 months at a usage rate of 18 hours per day 3 to 6 5 thousand hours total.