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[2014-03-05]
MH lamps use probe-start, magnetic ballast technology, which employs the use of two operating electrodes and a third, starting probe electrode in the arc tube.
Three electrodes are present in the arc tube of a probe-start MH lamp: a starting probe electrode and two operating electrodes . To start the lamp, a discharge is created across a small gap between the starting probe electrode (also called the starter electrode) and the operating electrode. Electrons then jump across the arc tube to the other operating electrode to help start the lamp. Once the lamp is started, a bi-metal switch removes the starting probe electrode from the circuit.
Probe-start ballasts start lamps when it discharges a high open circuit voltage between the starting probe and one of the operating electrodes. Once the lamp is started, a bi-metal switch shuts off the starting probe electrode from the circuit.
Market demand for probe-start ballasts began to wane once industry realized the third electrode and other moving parts such as the switch led to inconsistencies in the lamp’s lumen and color output over their lifetimes....
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[2014-03-05]
Magnetic ballast construction ideal for a wide variety of lighting applications.Precision-wound coils, ensuring even heat dissipation and the highest electrical integrity.Provide voltage to breakdown the gas between the electrodes of arc lamps and initiate starting.
Provide voltage and current to heat the electrodes to allow a low voltage, high current arc mode to develop (referred to as glow-to-arc transition, GAT).
Provide enough current to heat and evaporate the light emitting components after an arc has been established. Provide enough sustaining voltage (see Vss) to maintain the arc during warm-up and operation.
Set lamp current once all the evaporable materials have reached thermal equilibrium.
HID BALLAST LOSSES – Line input watts minus lamp watts equal ballast losses. Ballast losses represent the energy consumed by the ballast to operate the lamp. Standard industry practice is to measure and publish ballast losses without the luminaire. This practice has been followed because no two fixtures are alike in construction and component location or operate at the same temperature.The amount of energy consumed is dependent on the type of ballast selected, its design, construction, and materials composition, and operating ambient temperature. A non-regulating ballast can be designed to produce minimum losses at a specific line voltage. If the incoming supply is different, an additional transformer must be used and energy consumption increases substantially. Regulating ballast designs trade off losses for other desirable features such as
lamp wattage and line voltage regulation, dip tolerance, stable power factor and lower fusing currents. As a result, since regulating ballasts are being asked to do more work, these ballasts have the higher losses....
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[2014-03-04]
For many users, ballasts are a mystery. Electrical distribution systems deliver fixed AC voltage (50 or 60 Hz) and expect connected electrical loads to limit the current drawn from the source. 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. Ballasts use inductive and capacitive components because they impede alternating current with little power consumption. Resistive components generate high loss and are usually avoided. This is true of conventional electromagnetic ballasts as well as electronic ballasts.
Generally speaking, mercury lamps must be operated on mercury ballasts and metal halide lamps must be operated on metal halide ballasts. Failure to do so will compromise performance of the lamp system.
Consequences of operating mercury lamps on metal halide ballasts:
· Higher LPW
Shorter Lamp Life
· Ballast Incompatibility
Consequences of operating metal halide lamps on mercury ballasts:
· Lower LPW
· Shorter Lamp Life
· Poor Lumen Maintenance
· Ballast Incompatibility
Some ballast manufacturers no longer make mercury ballasts. They make metal halide ballasts and label them for both mercury and metal halide. For example, if a ballast is labeled for both 400W mercury and 400W metal halide...
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[2014-03-04]
Metal halide lamps are one of three types of high intensity discharge (HID) lamps in general use. The other two types are mercury and high-pressure sodium lamps. HID lamps have bright light output making them perfect for outdoor lighting.
Mercury vapor lamps are an old type of high intensity discharge (HID) lamp that are less efficient than the now widely used metal halide and high pressure sodium lamps. However, these lamps continue to be used, both in existing fixtures and in some applications where the lower cost of mercury vapor lamps and MV ballasts.
Mercury (or mercury vapor) lamps are the oldest and most mature of the three types. They have long lives, but are only slightly more efficient than incandescent lamps in terms of maintained efficiency over lamp life. The radiant energy from the arc of a clear mercury lamp is generated in four discrete visible spectral lines that produce an unattractive rendition of object colors and skin tones. Therefore,most mercury lamps today use coatings of chemical phosphors on their glass outer wall to modify and improve color rendering.
You cannot use a mercury ballast with a metal halide lamp. The power supplied by a mercury ballast for starting and for cycling is different from the metal halides requirements and the mismatch can cause explosive failure of the metal halide lamp. Metal halide bulbs must be run using matching metal halide ballasts....
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[2014-03-04]
Mercury Vapor Light Bulbs, a member of the high-intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. Mercury vapor light bulbs are available in numerous sizes and are for commercial and residential applications. Mercury vapor light bulbs require a matching metal halide ballast to operate.
"Mercury vapour lamp ballast" means a device that is marketed for use in general illumination and designed to start and operate mercury vapour lamps by providing the necessary voltage and current, but does not include ballasts that are designed and marketed for operation of mercury vapour lamps used in:
1,quality inspection;
2,industrial processing
3,scientific use, including fluorescent microscopy and ultraviolet curing....
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[2014-03-02]
James's qualified Small Flood Lights and are offered in 15-, 25- and 45-watt styles that are replacements for 100-watt quartz halogen through 175-watt metal halide fixture. These DesignLights Consortium®-qualified LED fixtures feature a self-contained driver and can mount in almost any angle with a yoke-style arm and an additional half inch national pipe thread (NPT) strain relief, which provides protection for the wire.
The upgraded Small LED Flood Lights create bright, shadow-free security and general lighting when illuminating facades, landscapes, parking areas and displays in hospitality, public places, office buildings, shopping plazas, apartment complexes, schools, healthcare facilities and other commercial properties.
Advantages:
1.Pretty appearance as quality
2. 70%-80% energy-saving
3. Long lifespan(50, 000H)
4. Fashion design and different types
5. Easy to install and use
6.RoHS, and CE approved
7.No risk of mercury emission, environmental protection
Feature:
1.High light efficiency imported LED chip, with patent technology integration encapsulation, light source with high efficiency.
2. The floodlight use Lithium battery driver and it can be chargeable.
3. It can be used in outdoor activities lighting (white).
4. It need to turn off the light when the battery's voltage is lower than setting voltage,or it will damage the battery.
5. It can work when using the DC12V input without connecting battery. It has two ways for the lighting.
6.Lithium battery charging indication: when it is charging and the indicator is red, it is green color when full, no charge, indicator is not shine....
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[2014-03-02]
Emergency Ballasts. Back up fluorescent emergency ballasts can be used for both normal and emergency operations. In the event of a power failure, the unit switches to emergency mode and operates the existing lamps for a minimum of 90 minutes. Each ballast includes a battery pack, battery charger, and inverter circuit, and can be top-mounted on the fixture or within the fixture wiring compartment.
Fluorescent emergency ballast
Painted durable steel casing
Contains battery, charger and inverter circuit
Meets or exceeds all NEC and Life Safety Code emergency lighting requirements
90 Minute emergency operation
120/277v 60Hz operation
led Charge indicator light and push-to-test switch
Cold starts and operates specified lamp types...
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[2014-02-20]
Outdoor flood light fixtures are used in a variety of general building lighting applications. For security, parking areas or just general lighting for any number of large spaces, these white lights are a good choice because of energy efficiency and the ability to differentiate colors. For security, they work well with camera systems, making them one of the best choices in each HID lighting. These metal halide flood light fixtures give you the optical control you need for any number of areas in your commercial building
LED floodlight is ideal for simple wall flood applications or for bridge underpass where no maintenance is required. This luminaire features an advanced LED optical system that provides improved lighting control versus a standard HID general flood to optimize distribution to meet photometric requirements. This fixture offers convenient mounting options for both vertical wall surfaces and horizontal ceilings to cover any mounting application required....
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[2014-02-19]
Lighting ballast for HID ballast kits including Metal Halide and High Pressure Sodium Lighting ballasts. Most magnetic HID ballasts are multi-tap, meaning they can be connected to several different voltages.
MH lamps use probe-start, electromagnetic ballasts technology, which employs the use of two operating electrodes and a third, starting probe electrode in the arc tube.
Probe-start ballasts start lamps when it discharges a high open circuit voltage between the starting probe and one of the operating electrodes. Once the lamp is started, a bi-metal switch shuts off the starting probe electrode from the circuit.
Market demand for probe-start ballasts began to wane once industry realized the third electrode and other moving parts such as the switch led to inconsistencies in the lamp’s lumen and color output over their lifetimes.
The development of pulse-start electronic and magnetic ballast, which create arcs by generating a high-voltage pulse using a circuit called an igniter, also moved industry away from probe-start ballasts.
Here we display wiring diagrams for metal halide (probe start), metal halide (pulse start) and high pressure sodium HID ballast kits. Most magnetic HID ballasts are multi-tap, meaning they can be connected to several different voltages. Here we display wiring diagrams for metal halide (probe start), metal halide (pulse start) and high pressure sodium HID ballast kits....
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[2014-02-18]
Magnetic ballast is the original type of ballast for a metal halide bulb, and for many years was the only option available. It remains the most common type, in part because it’s much cheaper to buy than electronic ballast. Depending on the wattage of bulb you’ll power with the magnetic ballast, expect at least a loss that will be around 10 percent of the lamp wattage, and can be much higher. You can buy magnetic ballast for metal halide lamps of up to 1500 watts.
Fluorescent and HID lamps require a ballast to apply starting voltage to the lamp and establish current flow – an "arc" – between the lamp electrodes. Once the lamp is operating, the ballast also regulates lamp current and power.Ballasts, particularly for fluorescent systems, can be further categorized by their lamp starting and operating method. Starting and operating methods now available are balanced between lamp life, energy consumption and overall system costs that allow the user to select the system best suited for their application....
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