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US 7,053,557 B2Granted
Retrofit light emitting diode tube
OwnerRobert Porter Cross, Robert Hartwell Cross +1inventors
InventorsRobert Porter Cross, Robert Hartwell Cross, Jeffrey Parker Cross
Life of this patent
Estimating the term…
Abstract
An LED light tube for replacement for fluorescent light tubes includes an elongated cylindrical transparent envelope, a base cap at each end of the envelope, and at least one LED device in electrical communication with the base cap. The LED light tube is adapted for use in troffer light fixtures.
Claims8
An LED light tube for replacement of a fluorescent light tube, the LED light tube comprising:
- an elongated, cylindrical transparent envelope;
- a base cap at each end of the envelope, wherein the base cap comprises a first prong and a second prong extending from the base cap;
- at least one serial string of LEDs in electrical communication with the base cap having circuitry means for connection with an AC source through a nondissipative voltage dropping element, wherein each one of the at least one serial string of LEDs are connected in parallel with the other and are enclosed in the envelope;
- and
- a varistor positioned in parallel with the at least one serial string of LEDs.
2 more elements
A troffer LED light tube fixture comprising:
- a housing comprising a tube holder, wherein the tube holder comprises electrical sockets adapted to receive and electrically communicate an LED light tube;
- an LED light tube disposed in the tube holder, wherein the LED light tube comprises an elongated, cylindrical transparent envelope, a base cap at each end of the envelope, wherein the base cap comprises a first prong and a second prong extending from the base cap, and at least one serial string of LEDs in electrical communication with the base cap having circuitry means for connection with an AC source through a nondissipative voltage dropping element, wherein each one of the at least one serial string of LEDs are connected in parallel with the other and are enclosed in the envelope;
- and
- a varistor positioned in parallel with the at least one serial string of LEDs.
1 more element
Dependencies are inferred from the claim text.