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High Pressure Sodium Lamp
What is a High Pressure Sodium Lamp (HPS)?
Invented in 1931, the high-pressure sodium lamp has a transparent discharge tube filled with a gas and sodium mixture (the conductor.) An electric current vaporizes the conductor causing it to glow, which results in the emission of light and heat.
A current regulating device, commonly known as the ballast, is required to limit and stabilize the current passing through the lamp, greatly reducing the loss of energy in the form of heat. The ballast also prevents overdriving of the bulb, resulting in longer bulb life.
Energy Efficiency
HPS is the most energy efficient lamp for greenhouse lighting. About 30% of the electric energy input is converted into PAR (the waveband between 400 -700 nm), compared to 6.7% for incandescent lamps. Only 14% of the light energy is in the waveband between 400 and 565 nm, and most of the rest in the region up to 700 nm, providing maximum plant growth. The rest is converted into heat energy.
The useful life of HPS lamps is twice that for Metal Halide (MH). The light output during the lamp life will drop less than 10%.
When to use HPS lamps
HPS lamps' result in excellent plant growth and development, provided the plants receive enough additional natural light. Due to the high surface temperature of the bulb (max. 450), the distance between the lamps and the plants should be sufficient to avoid crop damage.
HPS lamps are suitable for virtually all plant materials including vegetables, cut flowers, potted plants and bedding plants.
What makes P.L. Light Systems HPS fixtures unique?
1. P.L. Light Systems HPS fixtures are available in 150W, 250W, 400W, 430W, 600W, and the new 1000W model with two new specially designed 1000W reflectors
2. Available in 120, 208, 240, 277, 347, and 480 volts
3. Improved collar design for easy assembly and maintenance of all reflectors
4. Ventilated aluminum body allows for maximum cooling and increases dependability of internal components
5. Compact body reduces the blockage of incoming natural sunlight
6. C.S.A. and U.L. approved
7. Optional convertible ballast - toggle switch provides the option of using either HPS or Metal Halide bulbs in 400W/1000W
This article is a brief introduction of high pressure sodium lamp. let you know what is it and when use it.
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High Pressure Sodium Lamp
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