Ignitors. HID lamp ignitors provide a brief, high voltage pulse or pulse train to breakdown the gas between the electrodes of an arc lamp. Pulses can range from several hundred volts to 5KV. Typical durations are in the µsec range. They are usually timed to coincide with the peak of OCV.
What is an ignitor in lighting?
Ignitors An ignitor is a starting device that generates voltage pulses to start a discharge lamp. … This normally happens after the ignitor has tried to start the lamp a few times, and for metal halide lamps this is generally after approximately 15 minutes.
What is the function of ignitor in HPSV lamp?
So there is no enough space to provide any starting electrode in the arc tube. So a higher voltage is required to initiate the arc. A ballast with igniter is used for this purpose. High voltage is fed to the lamp from the ballast by using the phenomenon of superimposing a low energy high voltage pulse.
How do you test an HPS Ignitor?
Metal halide lamps do not require an ignitor to start, so the test for a failed ignitor for an HPS lamp is to screw in a metal halide bulb of the same wattage and see if it starts. If the MH lamp starts and a new HPS lamp does not start, the ignitor probably needs to be replaced.
Do metal halide lamps need igniters?
Pulse-start metal-halide bulbs don’t contain a starting electrode which strikes the arc, and require an ignitor to generate a high-voltage (1–5 kV on cold strike, over 30 kV on hot restrike) pulse to start the arc. Electronic ballasts include the igniter circuit in one package.
What are the symptoms of a bad igniter?
5 Signs of a Failing Ignition
- Car fails to start. Perhaps the most generic symptom of ignition trouble is a vehicle that won’t start. …
- Key will not turn. On the other end of the spectrum of obviousness is a key that will not turn in the ignition. …
- Stalling. …
- Flickering dashboard lights. …
- No noise from starter motor.
How does an ignitor work?
The core of the ignitor is a piezoelectric crystal. The piezoelectric crystal generates an electrical charge on its surface when it is subjected to pressure. … The ignitor then sends this high voltage electrical charge along the wire to the ignitor electrode, located inside the collector box.
Is a ballast a capacitor?
Ballasts vary greatly in complexity. They may be as simple as a resistor, inductor, or capacitor (or a combination of these) wired in series with the lamp; or as complex as the electronic ballasts used in compact fluorescent lamps (CFLs) and high-intensity discharge lamps (HID lamps).
Which type of light fitting design has free from glare?
Volumetric LED troffers are very effective in office settings, since their LED arrays and geometric features are optimized for a uniform lighting distribution that does not produce glare. These fixtures also offer a very high energy efficiency.
Why capacitor is used in sodium Vapour lamp?
Metallised polypropylene film capacitors are designed to compensate the inductive idle current drawn by discharge lamps (fluorescent lamps, high-pressure mercury vapour lamps, high-pressure sodium vapour lamps and metal halide lamps with a ceramic discharge tube) in 50 Hz/60 Hz grids.
How do you tell if a HPS bulb is burnt out?
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.
How do you test hid igniter?
If one doesn’t light when you turn on the headlights, proceed with this test: Have a helper watch the HID bulb closely as you turn on the headlight switch. They’re looking for any sign of flicker. If there’s no sign of lighting, it’s usually a bad ballast or igniter.
What causes a high pressure sodium light to go on and off?
High Pressure Sodium Lamps Normal end-of-life is usually indicated by the lamp cycling on and off. As the lamp accumulated burning hours, its operating voltage increases, eventually becoming higher than the voltage supplied by the ballast. The lamp extinguishes and cools.
What causes metal halide lamps to explode?
Metal halide lamps contain high-pressure gases in the arc tube. In the case of non-passive failure, the pressurized arc tube within the lamp causes the explosion. When the arc tube explodes, molten glass can fall from the fixture, which presents an obvious issue if a fixture is installed above flammable materials.
Can I use a higher wattage metal halide bulb?
You CAN run a lower wattage bulb SAFLEY on a higher power ballast. For example a 175 watt halide on a 400 watt ballast. ALL UL listed metal halide bulbs are internally protected, they can only draw their rated wattage. Go ahead and buy the big ballast in case you want to upgrade later.
How long do metal halide bulbs take to turn on?
Metal halide (MH) lamps do not achieve their full light output immediately after starting. Rather, they require a period of time-1 to 15 minutes-to reach 90% of their full light output. This period is called the warm-up (or run-up) time.