Long-life luminaires
First Claim
Patent Images
1. A long-life luminaire comprising:
- a string of long-life, low-voltage filaments;
said filaments becoming incandescent when heated;
means adapted to connect said filaments in series across a source of electrical energy;
a long-lived resistor connected in series with said string;
said resistor having a resistance at least equal to that of one of said filaments when incandescent.
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Abstract
There is provided a luminaire primarily for use with exit signs and other emergency-type lighting comprising a series string of low-voltage, extremely long-life filaments positioned within a sealed enclosure for protection and electrically connected to a standard base whereby luminaires having lives of 10 to 30 years may replace standard bulbs without the requirement of retrofitting.
18 Citations
10 Claims
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1. A long-life luminaire comprising:
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a string of long-life, low-voltage filaments; said filaments becoming incandescent when heated; means adapted to connect said filaments in series across a source of electrical energy; a long-lived resistor connected in series with said string; said resistor having a resistance at least equal to that of one of said filaments when incandescent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A long-life luminaire comprising:
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a string of long-life, low-voltage filaments; said filaments becoming incandescent when heated; means adapted to connect said filaments in series across a source of electrical energy; a sealed envelope within which said filaments are located, a second string of filaments in parallel with said first-mentioned string of filaments, and relay means included in said sealed envelope for initially energizing one of said strings of filaments and responsive to failure of said one of said strings to energize the other of said strings.
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Specification