Observe the interior gas tube for any signs of discoloration.
What does a high pressure sodium bulb look like.
Sodium mercury and xenon are usually used inside the arc tube.
Two varieties of such lamps exist.
Sunlite 100 watt ed17 high pressure sodium hid bulb 2100k e26 base 8500 lumens metal halide light bulb 2 pack model hd02487 2 19 99 19 99.
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.
The most common problem with a high pressure sodium light is the bulb.
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.
Check the porcelain holder for any signs of deep cracks or breaks.
If the tube is black the bulb is definitely burned out.
A 400w bulb can easily cover a gardening area of approximately 15 square feet while a 1000w bulb can be used on a growing area of around 7x7 feet.
The arc tube has a high pressure inside for higher efficiency.
The arc tube is made of aluminum oxide ceramic which is resistant to the corrosive effects of alkalis like sodium.
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The first course of action is to simply change the bulb.