Ballasts - High pressure discharge lamps (2024)

Ballasts - High pressure discharge lamps Print

Modified on: Mon, 20 Jun, 2016 at 9:44 AM

Ballastsare needed to run high pressure discharge Lamps with their various gas fillings (mercury vapour, sodium vapour or metal halide).

They stabilise the lamp current and thus lamp power. The rating of the ballast is important to ensure proper lamp operation.

In the case of low-power (150 W) metal halide lamps especially, an excessive temperature rise can occur in the ballast at the end of lamp life. The ballast should therefore always be fitted with overtemperature protection.

Whereas high pressure mercury lamps strike at mains voltage, most metal halide and high pressure sodium lamps require an additional Igniter.

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Ballasts - High pressure discharge lamps (2024)

FAQs

How do I know if my high pressure sodium bulb is bad? ›

The most common problem with a high pressure sodium light is the bulb. The first course of action is to simply change the bulb. Observe the interior gas tube for any signs of discoloration. If the tube is black, the bulb is definitely burned out.

What is the purpose of the ballast in a high pressure mercury lamp? ›

Low pressure and high pressure arc discharge lamps exhibit "negative impedance." Without a ballast, the arc will extinguish or draw increasing current until some circuit element burns up. Ballasts provide system stability by limiting the current that can be drawn.

What is a high pressure discharge lamp? ›

High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube.

Do HPS lights need a ballast? ›

Used to regulate current and voltage supplied to the lamp during start-up, and throughout operation, ballasts/drivers are an absolute necessity for HPS and other high-intensity discharge lighting.

What is the lifespan of a high pressure sodium lamp? ›

HPS fixture and lamp maintenance

As stated before, under normal operating conditions, replacing bulbs is recommended after 10,000 hours for mogul-base fixtures and 10,000 to 15,000 hours for double-ended fixtures. The number of times that a lamp is turned on or off will also affect the life of the bulb.

Do all high-pressure sodium lamps need a ballast? ›

Sodium vapor lighting typically requires a “warm-up” period in order to evaporate the internal gas into plasma. Additionally, as the light heats up it requires additional voltage to operate which is balanced by a ballast (a magnetic or electric device designed to provide the light constant current).

Are mercury vapor lights being phased out? ›

Mercury vapor lamps are becoming obsolete due to the higher efficiency and better color balance of metal halide lamps.

What are the disadvantages of high pressure mercury lamp? ›

Disadvantages of Mercury Vapor Lamp
  • Mercury vapor lamps require 5 to 8 minutes warm up before fully glowing the lamp.
  • Mercury vapor lamps are very sensitive for the voltage.
  • Their maintenance of lumen is poor.
  • Their cooling time is about 5 to 7 minutes.
Apr 5, 2022

What is a high pressure mercury discharge lamp? ›

The mercury vapor lamp is a high-intensity discharge lamp. It uses an arc through vaporized mercury in a high-pressure tube to create very bright light directly from its own arc. Mercury vapor lamp is deficient in red light. It emits a characteristic greenish-blue light.

What are the drawbacks of discharge lamps? ›

Disadvantages of HID Lamps

One of the disadvantages to the HID headlights is the brightness of the lights in the rearview mirrors. This causes a problem for drivers in front of your vehicle. It is so widely known that USA Today did an investigation and report on the headlights.

Is low-pressure sodium a high pressure discharge lamp? ›

Sodium gas discharge lamps can be distinguished in two main groups: low-pressure sodium lamps in which the gas pressure is very low (0.7 Pa or 7.106 atm) and high-pressure sodium lamps in which the gas pressure is a factor 10,000–100,000 times higher (10–100 kPa); [2–4].

What is the output Colour of a high pressure sodium lamp? ›

High pressure sodium (HPS) lamps are the most efficient member of the HID family where some degree of color rendition is important. Standard HPS lamps produce a golden white light when they reach full brightness. Many recognize them as the familiar golden light from street lights, one of their principal applications.

Can I mix LED lights with HPS lights? ›

A mix of both HPS and LED lighting provides an ideal distribution of both diffuse and directional light. Therefore, if you combine the already tested and true HPS luminaires with the more efficient LEDs, plants will be able to take and use the wavelengths they need (when they need them).

How do I know if I need a ballast? ›

Look at for these signs indicating that it's your ballast:
  1. Delayed start.
  2. Buzzing.
  3. Flickering.
  4. Low output.
  5. Inconsistent lighting levels.

Do high pressure sodium bulbs burn out? ›

The high pressure sodium bulb also contains metal compounds and inert gasses which are used to provide light and longevity, respectively. The sodium creates the particular type of light the bulb is known for and the gas stops the arc from burning out.

How long do high pressure sodium bulbs last? ›

Still, after 18,000 hours of use (around 12 to 18 months), they will start to consume a bit more electricity than their rated watts and these HPS lights will gradually produce less light because they will require more energy to maintain the gas inside.

When should I replace my HPS bulb? ›

For high pressure sodium lamps, replacement is typically recommended after 10,000 burning hours to ensure optimal light output. Metal halide lamps depreciate faster than HPS lamps – and are typically recommended to be replaced after 8,000 hours of normal operation.

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