82 results about "Lumen maintenance" patented technology

A knowledge-based driver is provided for powering a solid-state light source with a constant current, including a memory that stores lumens per amp and volts per amp performance characterizations of the light source over time, and a controller that operates in a test mode to estimate the light source degradation based on voltage feedback obtained at a predetermined test current value, and to adjust the drive current in normal operating mode according to the estimated device degradation to implement constant lumens control without external optical feedback components.

The invention relates to a high-pressure discharge lamp of the ceramic metal halide type of the Philips MasterColor series having a molybdenum coil wrapped around the discharge vessel and at least a portion of the electrode feed through means, and having power ranges of about 150 W to about 1000 W. Such lamps are provided with a discharge vessel which encloses a discharge space. The discharge vessel has a ceramic wall and is closed by a ceramic plug. An electrode which is located inside the discharge space is connected to an electric conductor by way of a leadthrough element. The leadthrough element projects through the ceramic plug with a close fit and is connected thereto in a gastight manner by way of a sealing ceramic. The leadthrough element has a first part which is formed by a cermet at the area of the gastight connection. In addition, the lamps display one or more and most preferably all of the following properties: a CCT (correlated color temperature) of about 3800 to about 4500K, a CRI (color rendering index) of about 70 to about 95, a MPCD (mean perceptible color difference) of about +10, and a luminous efficacy up to about 85-95 lumens/watt, a lumen maintenance of >80%, color temperature shift <200K from 100 to 8000, and lifetime of about 10,000 hours to about 25,000 hours. The invention also relates to design spaces for the design and construction of high power lamps and methods for construction of such lamps using the design spaces.

Novel red emitting phosphors for use in fluorescent lamps resulting in superior color rendering index values compared to conventional red phosphors. Also disclosed is a fluorescent lamp including a phosphor layer comprising blends of one or more of a blue phosphor, a blue-green phosphor, a green phosphor and a red a phosphor selected from the group consisting of SrY₂O₄:Eu³⁺, (Y,Gd)Al₃B₄O₁₂:Eu³⁺, and [(Y_1-x-y-mLa_y)Gd_x]BO₃:Eu_m wherein y<0.50 and m=0.001-0.3. The phosphor layer can optionally include an additional deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of the disclosed red phosphors in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over the course of the lamp life.

The invention relates to a rapid LED illumination product service life and reliability evaluation method. The method comprises steps that 1), a test sample is divided into multiple groups, and initialluminous fluxes and color coordinates of the samples are measured; 2), different temperature and humidity combination stresses are employed, and an acceleration experiment of each group of sample iscarried out; 3), a luminous flux and a color coordinate of each group of sample are respectively measured at multiple time segments, and lumen maintenance and color drift are calculated; 4), lumen maintenance degeneration data fitting and color drift data fitting are carried out to acquire a lumen maintenance degeneration locus equation and a color drift degeneration locus equation; 5) a lumen maintenance failure threshold and a color drift failure threshold are determined; and 6), lumen maintenance service life and color drift service life of LED illumination products under normal work conditions are respectively acquired according to the degeneration locus equations and a temperature-humidity Weibull model. The method is advantaged in that the test time is shortened to 1000 hours on thecondition that service life evaluation precision is not influenced, and product service life and reliability can be truly reflected.

A lamp includes a discharge vessel with electrodes extending into the discharge vessel and an ionizable fill scaled within the vessel. The fill includes a buffer gas, optionally mercury, and a halide component. The lamp includes available oxygen, sealed within the discharge vessel, at a concentration of at least 0.1 μmol O/cc.

The present invention aims at providing a metal halide lamp that (i) prevents a decline in the lumen maintenance and a deterioration of quality in appearance due to the coloring of a casing tube surrounding the arc tube, and at the same time (ii) achieves high luminous efficiency. A metal halide lamp (1) has a pair of electrodes (20a&b) placed in an arc tube (3) made of translucent ceramic, and a sodium halide is enclosed therein. The metal halide lamp (1) satisfies L/D 4, where L (mm) is the length of the space between the electrodes (20a&b) and D (mm) is the internal diameter of the arc tube (3). The metal halide lamp (1) has a casing tube (2) surrounding the arc tube (3), at least around a portion between the electrodes (20a&b). Here, R/r 3.0 is satisfied, where R is the internal diameter of the casing tube (2) and r is the external diameter of the arc tube (3), within a region positionally corresponding to, in a radial direction of the arc tube, the space between the electrodes (20a&b), on a cross-sectional surface where an outer circumference of the arc tube (3) comes closest to the internal circumference of the casing tube (2).

A lamp includes a discharge vessel and electrodes extending into the discharge vessel. The lamp further includes an ionizable fill sealed within the vessel. The fill includes an inert gas and a halide component. The halide component includes a sodium halide, a thallium halide, at least one of a calcium halide and a strontium halide, and at least one of a rare earth halide. The rare earth halide is selected from the group consisting of lanthanum, cerium, praseodymium, samarium and neodymium, and combinations thereof.

LED lamps having a high color rendering index are disclosed. In some embodiments, such lamps also exhibit high lumen maintenance and low color drift during lamp warm-up. The lamps may include, for example, a light emitting diode (LED) kernel having a mixture of red and blue LEDs, and a converter including a red phosphor in an amount ranging from greater than 0 to about 10 weight % of a total phosphor content of the converter.

The embodiments of the invention disclose a light intensity compensation method and device for operating lamps, a terminal and a computer storage medium. The method comprises the following steps: identifying the working state of the operating lamp, and acquiring the accumulated working time of the operating lamp in each working state; determining the lumen maintenance rate of the LED light sourceaccording to the cumulative working time of the LED light source in each working state of the operating lamp; according to the lumen maintenance rate of the LED light source, compensating for the light intensity of the LED light source. Thus, the lumen maintenance rate of the LED light source can be determined according to the accumulated working time of the LED light source in different working states of the operating lamp; according to the lumen maintenance rate of the LED light source, the intensity of the LED light source in the operation lamp can be compensated for, and the luminous fluxattenuation of the LED light source in the operation lamp can be improved.

A novel cathode of a fluorescent lamp is composed of superfine flat filaments of T1-T2 tube diameter, V type filaments of 1.5 times of T3-T4 tube diameter, U type filaments of 2.5 times of T5 tube diameter or S type filaments of 3 times of tube diameter, the filaments are made into double spirals, three spirals or main and auxiliary type three spirals by tungsten filaments, are dip coated or electrophoresised with ternary carbonate electric powder on the surface, are exhausted to electrically decompose into oxide electrodes, under the condition that the lamp tube is used for driving an electronic ballast, a hot cathode wiring method without filaments can be adopted. The invention not only solves the problem that the tube diameter below T3 is not easy to seal and assemble, but also solves the key problem of making the T1 hot cathode fluorescent lamp without the method, and solves the problem that the electric powder storage is not enough after thinning the tube diameter of the fluorescent lamp. The invention is useful for improving switching characteristic of the fluorescent lamp, increasing lumen maintenance rate and prolonging light decline. The test proves that fifty present to one time of life service of the one lamp tube can be extended.

The invention relates to a high-pressure discharge lamp of the ceramic metal halide type having a molybdenum coil wrapped around the ceramic discharge vessel and at least a portion of the electrode feed through means, and having power ranges of about 150W to about 1000W. The discharge vessel has a ceramic wall and is closed by a ceramic plug. An electrode which is located inside the discharge space is connected to an electric conductor by way of a leadthrough element. The leadthrough element projects through the ceramic plug with a close fit and is connected thereto in a gastight manner by way of a sealing ceramic. The leadthrough element has a first part which is formed by a cermet at the area of the gastight connection. In addition, the lamps display one or more and most preferably all of the following properties: a CCT (correlated color temperature) of about 3800 to about 4500K, a CRI (color rendering index) of about 70 to about 95, a MPCD (mean perceptible color difference) of about +/-10, and a luminous efficacy up to about 85-95 lumens/watt, a lumen maintenance of >80%, color temperature shift <200K from 100 to 8000, and lifetime of about 10,000 hours to about 25,000 hours. The invention also relates to design spaces for the design and construction of high power lamps.

The invention discloses a method and a device for accelerated detection of lumen maintenance of a lighting device. The method for accelerated detection of the lumen maintenance of the lighting device comprises the steps of determining a detection temperature, wherein the detection temperature is the environmental temperature at which the accelerated detection is conducted on the lighting device, and the detection temperature is higher than the normal temperature; adjusting the current environmental temperature to the detection temperature; and conducting accelerated detection on the lumen maintenance of the lighting device at the detection temperature. By the aid of the method and the device, the fact that the detection temperature is higher than the normal temperature is confirmed before the lumen maintenance of the lighting device is detected, so that the detection temperature guarantees that the detection period of the lighting device is shortened on the condition that a failure mechanism is not changed, and the life of the lighting device can be detected quickly.

The invention relates to a LED filament ball steep light with high lumen maintenance. The LED filament bulb light comprises an inclosed bulb shell and a bulb holder, wherein the bulb holder and the bulb shell are connected mutually and fixedly, a light staff, located inside the bulb shell, is fixedly connected on the bulb holder, and an LED light source is arranged on the light staff. The LED filament ball steep light is characterized in that the LED light source and the bulb holder form electrical connection, the bulb shell is filled with mixed gas, and the mixed gas comprises oxygen and high thermal conductivity gases, wherein the volume ratio of oxygen is 0.1% to 30%. The oxygen added into the gas can prevent reducing of the transmittance of ITO due to the fact that an ITO layer in an LED chip is reduced in gas in an oxygen-free environment in the aging process, therefore the lumen maintenance of filament aging is enhanced, and brightness decay is reduced. 1000H aged light of a filament with a good performance is kept at about 97% at present, 1000H lumen maintenance of a bulb with conventional gas is kept at about 96%, and the 1000H lumen maintenance of a bulb with gas added with oxygen in the scheme is kept at about 98.5%.

An arc tube mounting assembly (1) for a metal halide arc lamp (10) includes frame members (8, 9) for supporting an arc tube (2). The arc tube (2) is supported from above by a looped frame member (8) having a loop (8A) which extends along opposing sides, and across top and base ends (2A, 2B) of the arc tube (2), thus evenly distributing the current to discharge electrode 7, thereby cancelling magnetic forces which could displace the arc from the center of the arc tube (2), resulting in improved lumen maintenance and extended life. A centering circle (8B) of the frame member (8) wraps around the lower ceramic end plug (4), providing coaxial alignment of the arc tube (2) and the tubular outer envelope (11).

The invention describes a mercury-free high-intensity gas-discharge lamp (1) comprising a discharge vessel (5) enclosing a fill gas in a discharge chamber (2) and comprising a pair of electrodes (3, 4) extending into the discharge chamber (2), for which lamp (1) the fill gas is derived from a salt fill introduced into the discharge chamber (2) prior to sealing, which salt fill is free of scandium and includes a halide composition comprising a sodium halide to a proportion of at least 65 wt % and at most 97.2 wt %,a thallium halide to a proportion of at least 2 wt % and at most 25 wt %, and an indium halide to a proportion of at least 0.5 wt % and at most 25 wt %. Eliminating the highly reactive scandium from the fill gas significantly improves lumen maintenance.

The invention discloses a preparation method of a high strength gas discharge electrode. By instantaneously fusing the discharge end part of the electrode with high temperature, oxygen content and purities of fusion part are eliminated, the metallographic structure of the discharge end part of the high strength gas discharge electrode is improved, the metallographic structure is densified, the sputtering of the discharge electrode in the high strength gas discharge light source igniting process is reduced and consequently, the service life of the high strength gas discharge light source is prolonged and the lumen maintenance therefore is improved.

A low wattage mercury vapor lamp comprises a discharge vessel (10) including a tubular body (12), first and second electrodes (20, 22) and two end walls (16, 18), which close opposite ends of the tubular body. The discharge vessel contains an ionizable fill material having a concentration of mercury of from 0.10 to 0.20 mg/mm³. The discharge vessel operates at elevated pressures of from 80 to 170 atmospheres at power of 20 watts resulting in improved lumen maintenance and reduced through-life color shift.

The invention belongs to the technical field of the energy-saving light source material and relates to ultra-low-sodium lead-free glass and applications thereof. The sodium content of the ultra-low-sodium lead-free glass is below 0.5% and above 0.23%, thus the lumen maintenance of the lamp tube is extremely improved in the use process, the luminous decay of the lamp tube is minimized, the effect of extremely high lumen maintenance is realized without adopting protective film coating, the cost is saved and the coating difficulty of the fluorescent powder is reduced. The ultra-low-sodium lead-free glass does not contain As2O3 and Sb2O3; the content of PbO is extremely low, which is below 0.012%, thus the product belongs to lead-free glass; and the weight percent of CeO2 is not zero and the glass material meets the Rohs environmental protection standard. The ultra-low-sodium lead-free glass can be widely used to prepare various electronic luminous bodies such as fluorescent lamp tubes or energy saving lamp tubes.

The present invention aims to realize a fluorescent lamp and a lighting instrument installed the fluorescent lamp, the fluorescent lamp restrains the light reflection membrane from membrane stripping, and makes lumen maintenance rate and exterior quality promote. The fluorescent lamp of the present invention has: a sealed tubular glass bulb; an electrode generating unit making the bulb generate discharge; a discharge medium enveloped into the bulb; a protective membrane formed at the internal surface of the bulb and the membrane thickness is 0.2 to 0.9 micrometer; a light refection membrane formed at the regulated position of the protective membrane, and containing more than or equal to 25wt percent strontium pyrophosphate phosphor particulate; and a fluorophor membrane formed at more nearby to the internal side part than the light reflection membrane. According to the present invention, it can promote the lumen maintenance rate through thickening the protective membrane and restrain the light reflection membrane from membrane stripping.