Lighting device

Illumination – Plural light sources – With modifier

Patent

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Details

362249, 362800, 362812, G09F 1304

Patent

active

056558309

ABSTRACT:
A long life, low maintenance and low energy consumption-lighting device (15) for connection with an electrical socket within a housing of an exit sign comprises a string (35, 35, 60) of series connected light emitting diodes (38) connected in a circuit comprising a capacitor (55) for limiting the current flow through the light emitting diodes (38) and a resistor (40) to limit the surge current through the light emitting diodes (38). The resistor (40), capacitor (55) and light emitting diodes (38) are connected to the socket by one of several different standard light bulb bases (20), and are housed within a hollow translucent or transparent tube connected to the base (20). A surge suppression device (59), such as a TRANSZORB, may be connected in parallel with the resistor (40), capacitor (55) and light emitting diodes (38) to provide line transient protection for protecting the light emitting diodes (38) in response to transient voltage spikes. The lighting device (15) may be provided with a pair of series connected light emitting diode strings (35, 36) connected in parallel with one another, the diodes (38) in one string (35) being connected in opposite polarity to the diodes (38) in the other string (36). Additionally, the light emitting diodes (38) may be either discrete light emitting diodes (38) or die-on type light emitting diodes (100) mounted on one or both sides of a printed circuit board (105).

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Product brochure for Merlin Exit Retrofit Kit, Lithonia Lighting Emergency Lighting Systems, One Lithonia Way, Decatur, GA, 30035, Dated Nov. 1994.
Advertisement for Exit Sign Retrofit Kit, New Equipment Digest, 1100 Superior Avenue, Cleveland, OH, Mar., 1995.
Product brochure for Watt-Man.TM. Led Exit Retrofit Lamp, Standard Enterprises Inc., 12958 Harbor Drive, Suite 100, Lake Ridge, VA 22192 .COPYRGT.1995.
Product brochure for Watt-Man.TM. Led Exit Retrofit Lamp, Printed in USA.

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