602 results about "Metal-halide lamp" patented technology

A three-stage electronic ballast for metal halide lamps mainly comprises a step-up converter, a step-down converter and a full-bridge DC-AC converter, wherein the step-down converter operates an inductor in a continuous boundary current mode to achieve reducing power loss and enhancing efficiency. Equipped with a micro processor, the electronic ballast further possesses the function of power regulation. The electronic ballast can be added with various protective functions without complex control circuits and sensing elements, thereby becoming a high-quality and low-cost electronic ballast for metal halide lamps.

A light source comprises a lamp such as an ultra-high pressure mercury lamp or a metal halide lamp and its irradiated light is emitted after being parallelized by a parabolic reflector. The parabolic reflector is made by pressing metal such as stainless and its light exit side aperture is covered with a transparent plate made of glass, etc. The transparent plate prevents fragments of glass of the lamp and the like from scattering when the lamp bursts. The parabolic reflector does not have an aperture (cut-out) for ventilation, but heat radiation fins are formed on the outer surface of it.

A metal halide lamp (10) includes a discharge vessel (12) which may be formed of a ceramic material. The vessel defines an interior space (16). An ionizable fill (17) is disposed in the interior space. The ionizable fill includes an inert gas, mercury, and a halide component. The halide component includes an alkali metal halide, an alkaline earth metal halide component, and optionally at least one of a rare earth halide and a Group IIIA halide. The alkaline earth metal halide component includes at least one of a barium halide and a strontium halide. At least one electrode (18, 20) is positioned within the discharge vessel so as to energize the fill when an electric current is applied thereto. The lamp having a wall loading, when energized, which is sufficient to maintain an active tungsten halogen cycle.

A thallium-free high pressure ceramic metal halide lamp having superior dimming characteristics with a fill composition comprising MgI2 and CeI3. In addition, the fill chemistry comprises NaI and the halides of rare earth metals such as Dy, Ho and Tm.

Mercury-free metal halide lamp with a warm white luminous color, the fill of which comprises the following components: an inert gas which acts as a buffer gas; a first group of metal halides (MH), the boiling point of which is above 1000° C. (preferably above 1150° C.), the first group comprising at least Dy and Ca used simultaneously as metals, and the molar ratio of the two metal halides Ca-MH:Dy-MH being between 0.1 and 10; these are components with a low volatility which are present in saturated form; a second group of metal halides, the boiling point of which is below 1000° C. (preferably below 900° C.), the second group comprising at least one of the elements In, Zn, Hf, Zr as metals; these are volatile components which are mostly present in unsaturated form; the total fill quantity of the first group of metal halides being between 5 and 100 mumol/cm3; the total fill quantity of the second group of metal halides being between 1 and 50 mumol/cm3; and the color temperature being between 2700 and 3500 K; the general color rendering index being at least Ra=90, while at the same time the red rendering index is at least R9=60.

The present invention provides an electronic ballast for a high intensity discharge lamp such as a metal halide lamp. The ballast includes an inverter and a resonant circuit with an ignition capacitor between the resonant circuit and the lamp. The ignition capacitor serves to provide the necessary start-up energy and also serves to provide a low impedance discharge path. A single ignition capacitor may be sufficient, but if a long cable is used to connect the lamp to the ballast, then two ignition capacitors in parallel at opposite ends of the cable may be used. The ballast further provides means for monitoring and controlling lamp power by monitoring a nominally constant dc link voltage, and means for detecting short-circuit and open circuit conditions. A retrial mechanism is provided in the event of the lamp failing to ignite that includes a temporary disabling of the inverter in order to keep the rms lamp voltage low.

This invention provides a method of delivering light internally to a Photo-Bioreactor growing algae for production of Biodiesel fuel. The invention also provides an improved method of delivering liquid nutrients [I.e. sewage] and carbon dioxide to the growing algae in a Photo-Bioreactor. These results are achieved by a single system which delivers fiber optic light as well as liquid nutrients and carbon dioxide via jets. The net result attained by using this invention is a significant increase in the production of valuable algae with a very small increase in energy consumption. The increase in energy usage is the electrical energy required to power a 150 watt metal-halide bulb.

A device and method for retrofitting a light fixture from use with a lamp socket that employs a conventional incandescent or metal halide lamp, to use with a light emitting diode (LED)-based lamp assembly. The lamp fixture has a collar with a base and an annular outer wall extending out from the base. The LED lamp device includes a neck base having an annular outer wall having a shaped outside surface that is placed into direct surface contact with the inner surface of the annular outer wall of the collar, to establish an effective heat-transferring interface. The shaped outer surface of the neck base provides proper fitting of the LED lamp device into the lighting fixture, and provides a heat-transferring interface over substantially all of the outer surface of the neck base, to dissipate heat away from the LED module. Aluminum material provides high thermal conductivity, light weight, availability, and low cost.

This light emitting LED device provides a 360 degree lighting angle in the horizontal plane and a 300 degree lighting angle in the vertical plane while simultaneously addressing LED die thermal management; critical to high lumen output LEDs.

This LED lighting device is comprised of the LED lens, the LED holder and the heat sink stem.

Light produced by at least one LED die traveling vertically is diffused by the top refractive portion of the lens. Light rays directed towards the pointed elements are totally internally reflected downwards then refracted out of the lens, thus resulting in a spherical light pattern.

This technology is designed as a replacement for conventional light sources, such as; incandescent light bulbs, halogen bulbs, CFLs (compact fluorescent lamps) and metal halide lamps.

An arc discharge metal halide lamp having a discharge chamber having visible light permeable walls bounding a discharge region supported electrodes in a discharge region spaced apart by a distance L_e with an average interior diameter equal to D so they have a selected ratio with D exceeding a minimum value. Ionizable materials are provided in this chamber involving a noble gas, one or more halides, and mercury in an amount sufficiently small so as to result in a relatively low maximum voltage drop between the electrodes during lamp operation for a lamp dissipation sufficient to have the chamber wall loading exceed a minimum value or so as to maintain chamber luminosity above a minimum value for a selected operational duration.

Metal halide lamp includes a discharge vessel having a ceramic wall with an internal diameter Di and enclosing two electrodes whose tips are a distance EA apart, wherein EA/Di>5. The vessel has a filling comprising Hg, CeI, and LiI.

A metal halide lamp comprised of a ceramic discharge chamber containing an ionizable fill, said fill comprising Hg, and halides (H) of Na, TI, an alkaline earth metal, and 0>rare earth element (Re)<15 as a molar fraction.

A lamp includes a discharge vessel. Tungsten electrodes extend into the discharge vessel. An ionizable fill is sealed within the vessel. The fill includes a buffer gas and a halide component that includes a rare earth halide. A source of oxygen which includes a lanthanide oxide is present in the discharge vessel. The source of oxygen provides oxygen for a regenerative cycle which reduces blackening of the lamp walls by tungsten from the electrodes.

A combined power and data track lighting system includes an elongated track, having a number of longitudinal guide ways, for attachment to a support surface, as well as a number of current carrying conductors arranged within at least some of the guide ways. The first of these conductors are power conductors and the second conductors are data conductors, the conductors being electrically isolated from each other. The lighting system further contains a first adapter for connection to source of electrical power for the power conductors, and a second adapter for connection to a source of control data. There is at least one LED luminaire present in the system, and this luminaire contains a number of LEDs, each of which, when energized, generates a single color out of a discrete plurality of colors. A data converter converts data along the data lines to control the currents in the individual groups of color LEDs, so that they create a desired composite color. Further, at least electrically, the LED luminaire is electrically connected to the power conductors and data conductors located in the lighting track. Likewise, at least one each of a Quartz luminaire, Metal-Halide luminaire, Digital Light Processor (DLP) automated computer luminaire, Liquid Crystal Display (LCD) automated computer luminaire, and DMX controlled device can be used in the present system including support trusses. The main control data will be Remote Device Management RDM supplied by an external controller applied to the data conductors of the combined power and data track lighting system.

A lighting system includes a high intensity discharge metal halide lamp having an arc discharge chamber with electrodes at each end and containing a fill of mercury, rare gas and metal halides, and a ballast circuit configured to supply pulsed electrical power to the lamp. The ballast circuit includes a controller configured to adjust the pulsed lamp power between a first relatively high power level at a relatively high duty cycle and a second relatively low power level at a relatively low duty cycle. The controller may be configured to adjust the pulsed lamp power between 90% duty cycle at rated lamp power and 10% duty cycle at 30% of the rated lamp power. The duty cycle of the pulsed lamp power may be controlled to maintain a substantially constant correlated color temperature (CCT) as the power level is adjusted.

A mercury-free metal halide lamp with a light efficiency of at least 70 Im/W and a color rendering index of at least 80 has a ceramic discharge vessel, into which electrodes are introduced in a vacuum-tight manner. The fill comprises the following components: an inert gas which acts as buffer gas, a compound of a halogen X with at least one of the metals hafnium and/or zirconium (referred to below as metal halide HZM), this halide being referred to below as HZH for short, HZH simultaneously performing tasks of voltage gradient formation and of promoting the cycle, a light generator comprising at least a further metal halide, at least one further metal halide MYn which vaporizes readily and is used as voltage gradient generator, the specific molar content of HZH being greater than or equal to 3 mumol/cm3. In addition, the following relationship applies: 5<=(X+Y)/HZM<=15, resulting in a lamp service life of more than 5000 hours.

A translucent polycrystalline material suitable for use in ceramic discharge vessels for metal halide lamps is produced by sintering an alumina powder doped with a MgO sintering aid in a nitrogen atmosphere containing a partial pressure of a vapor phase carbon-containing species. The sintered polycrystalline alumina has a grain boundary phase containing aluminum, oxygen and nitrogen. The formation of the AL—O—N grain boundary phase is believed to facilitate the transport of nitrogen from entrapped pores during sintering. Preferably, the PCA is sintered in a carbon-element furnace under flowing ultra-high-purity nitrogen.

A metal halide lamp comprises a discharge container including a discharge space and a pair of sealing sections. A discharge medium containing a metal halide and a rare gas and essentially free from mercury is sealed in the discharge container. A pair of electrodes are arranged to face each other within the discharge space, and the side edge portions on the side of the proximal end portion of these electrodes are held by the sealing sections. The amount of water contained in the metal halide, i.e., the light-emitting material, included in the metal halide lamp essentially free from mercury, i.e., Hg-less metal halide lamp, is controlled to 50 ppm or less.

To improve the ratio between first and second halides sealed in a mercury-free lamp, thereby providing a metal halide lamp which has a high luminous efficiency and a low lamp voltage reduction and emits light of an appropriate color and an automotive headlamp apparatus incorporating the same. A metal halide lamp includes a hermetic vessel 1 which is fire resistant and translucent; a pair of electrodes 3, 3 sealed in the hermetic vessel with facing each other at a distant of 5 mm or less; and a discharge medium substantially containing no mercury, sealed in the hermetic vessel 1, and containing first halides mainly including scandium halide and sodium halide, a second halide for mainly providing a lamp voltage and a xenon gas at 5 atmospheres or higher at a temperature of 25° C., the amounts of scandium halide and sodium halide sealed in the hermetic vessel satisfying the formula of 0.25<a/(a+b)<0.5, where reference character a denotes the mass of scandium halide and reference character b denotes the mass of sodium halide, in which, in a stable state, the metal halide lamp is turned on with a lamp power of 60 W or lower.