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7489086 |
AC light emitting diode and AC LED drive methods and apparatus
An AC LED package and circuits are disclosed along with an AC LED driver. The AC LED circuit may include as few as one LED or an array of anti-parallel LEDs driven with AC power sources and AC LED...
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7482761 |
Light emitting diode lamp assembly
A light emitting diode (LED) lamp assembly comprises an LED string and a plug. The LED string comprises multiple LEDs connected together in series. The plug is connected to the LED string and an...
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7138770 |
LED driving circuit
An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches...
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6366214 |
Warning light
A warning light that comprises at least one circuit board with a multiplicity of LEDs which has a low current draw as compared to an equivalent incandescent bulb, and fits a standard incandescent...
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6322381 |
Cold cathode lamp lampholder with mains switching
A lampholder for use with cold cathode lamps intended to be wired in a parallel configuration includes an insulating bulb-end receptacle mounted in a conductor housing. The receptacle is divided...
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6144311 |
Traffic signalling apparatus for self-illuminating displays
A traffic signalling apparatus wherein LEDs are employed to present various displays and the LEDs are secured with their sidewalls in a tubular holding device such that a good heat discharge from...
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5726535 |
LED retrolift lamp for exit signs
A retrofit lamp having light emissive diodes, and more particularly, to a retrofittable lamp configured as a standard incandescent lamp which can be used effectively in illuminated signs, such as...
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5463280 |
Light emitting diode retrofit lamp
A retrofittable lamp using light emitting diodes as the illumination source, the lamp is fitted with any one of the common lamp bases and is intended as a retrofit for incandescent lamps having...
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5387847 |
Passive power factor ballast circuit for the gas discharge lamps
A ballast for a gas discharge lamp circuit has a d-c output which contains three series-connected diodes connected across the output terminals, a pair of capacitors connected from different...
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5363017 |
Starting capacitor disconnect scheme for a fluorescent lamp
A starting capacitor disconnect scheme for a fluorescent lamp system in which each starting capacitor shunts one or more series connected fluorescent lamps until all of the fluorescent lamps are...
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5247228 |
Fluorescent lamp ballast adaptor
An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type...
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5239236 |
Field lighting network with a distributed control system
A field lighting network providing for individual control of the light fittings while reducing overall cable costs. A converter unit converts a supply voltage obtained from an A.C. main to a...
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5138233 |
Driver circuit for a plurality of gas discharge lamps
A circuit (500) for driving two or more series-connected gas discharge lamps, having: an oscillator (518, 520, 522); and a transformer (524) with a primary winding (526) and a secondary winding...
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5013970 |
Peak voltage reducer circuit for fluorescent lamps
A rapid start fluorescent system which has its starting capacitance connected to a tap on the secondary of the ballast transformer which tap is located at a predetermined number of turns of the...
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4847536 |
Power reducer for fluorescent lamps
An attachment is provided for connection in fluorescent lamp circuits for reducing power consumption. The attachment is particularly designed for use with fluorescent lamp circuits having an...
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4644227 |
Three lamp ballast
A low pressure gas discharge lamp ballast circuit is provided for three series-connected low energy gas discharge lamps, in which a first starting capacitor provides a starting voltage to one of...
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4600489 |
Method and apparatus for evaporation arc stabilization for non-permeable targets utilizing permeable stop ring
Apparatus and method for evaporation arc stabilization including a target having a surface of material of non-permeable material to be evaporated; circuitry for establishing an arc on the target...
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4513225 |
Fluorescent lamp series system
A pair of 48-inch long preheat fluorescent lamps, each one and a half inches diameter and consuming less than 10 watts power per foot of length, are connected in series with each other and with a...
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4475064 |
Means for controlling lumen output in power consumption of phosphor excitable lamps
A device and a method for reducing power consumption and correspondingly reducing lumen output of a phosphor excitable lamp, such as a fluorescent lamp, connected to a source of power for operation...
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4443739 |
Electric device comprising at least one low-pressure mercury vapor discharge tube
An electric device comprising at least one low-pressure mercury vapor discharge tube intended to be connected to an AC voltage source at a frequency of 50 to 60 Hz. The discharge tube is of a type...
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4317069 |
Means and method for controlling lumen output and power consumption of phosphor excitable lamps
A device and a method for reducing power consumption and correspondingly reducing lumen output of a phosphor excitable lamp, such as a fluorescent lamp, connected to a source of power for operation...
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4286194 |
Generator for use with loads having changing impedance characteristics
A generator for the starting and thereafter maintaining energization and operation of a load which has a relatively high impedance during starting and a substantially lower impedance after starting...
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RE30687 |
Energy saving device for a standard fluorescent lamp system
There is provided in combination with a rapid-start series-sequence type ballast for two low-pressure mercury discharge lamps, apparatus for reducing the power consumption of both lamps. The...
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4259614 |
Electronic ballast-inverter for multiple fluorescent lamps
An electronic ballast-inverter for multiple fluorescent lamps employs a push-pull inverter and a series resonant circuit for driving the lamps. The inverter operates at the resonant frequency of...
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4255692 |
Non-light producing phosphor energizable lamp simulator and methods of using same and making same
A lamp simulator for use as a replacement for a phosphor excitable lamp, such as a fluorescent lamp in a plural lamp fixture. The fixture is typically one with socket-type connectors adapted to...
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4135115 |
Wattage reducing device for fluorescent fixtures
A device which is designed to save electrical energy expended by a regular rapid start fluorescent lighting fixture having a plurality of lamps, or tubes, and a conventional ballast. The device...
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3956665 |
Device for replacing a fluorescent lamp in a serially connected fluorescent lamp system
A device for replacing a fluorescent lamp in a two lamp serially connected fluorescent fixture either of the type which includes a rapid-start type transformer for every two rapid-start fluorescent...
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3954316 |
Electrical apparatus and method for reducing power consumption of a fluorescent lamp system
An attachment is provided for inclusion in a two-lamp rapid-start type fluorescent lamp and encapsulated ballast transformer combination to reduce the electrical power consumption thereof,...
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3911320 |
Multiple lighting level ballast for fluorescent lamps
A ballast for starting and operating rapid-start fluorescent lamps includes a switch coupled to the running capacitor means in the ballast circuit. The switch can be selectively operated to a...
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3801865 |
SYSTEM FOR SUPPLYING ELECTRIC POWER TO LOADS IN HAZARDOUS ATMOSPHERES
In a power supply system for use in hazardous conditions, such as in mines, an inverter housed within a flame-proof enclosure is connected to a d.c. supply line and generates an a.c. output around...
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3660716 |
FLUORESCENT LIGHTING CIRCUIT
The specification discloses a circuit for starting a plurality of fluorescent lamps. The ordinary fluorescent lamp requires a heavy inductance, usually referred to as a ballast, for starting the...
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3416028 |
Circuit for operating multifilament incandescent lamps at different intensities
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3397343 |
Plural lamp starting circuit utilizing high impedance and glow discharge switch to cause the lamps to act as ballasts
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3323013 |
Systems and ballast apparatus for operating fluorescent lamps at preselected levels of illumination
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3287601 |
Two-lamp mercury ballast
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3250952 |
Ballast apparatus for starting and operating a pair of fluorescent lamps
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3243651 |
Ballast structure for fluorescent lamps
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3242381 |
Ballast apparatus for operating fluorescent lamps and electrical coil assemblies therefor
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3234429 |
Electrical circuit for electrohydraulic systems
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3191039 |
Photomodulating circuit using two alternately energized light sources
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3139586 |
Balancing system for pulse generators
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3107317 |
Regulating ballast for fluorescent lamps
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3080503 |
Ballast apparatus for starting and operating gaseous discharge lamps
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2980823 |
Low voltage electric ignition system
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2952797 |
Mercury vapor lamp connector construction and starting circuit therefor
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2950419 |
Ignition apparatus
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2924714 |
Electron accelerator
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2900577 |
Ballast and lighting system for fluorescent lamps
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2897403 |
Fluorescent lamp lighting circuit
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2834917 |
Device for starting and stabilizing a welding arc
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