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US 9,607,821 B2Granted
Modified spectrum incandescent lamp
AssigneeOsram Sylvania Inc.
InventorsRobert E. Levin, Ronald Blose, Richard Comtois
Life of this patent
Estimating the term…
Abstract
There is herein described a lamp having a light-transmissive envelope, a tungsten-halogen capsule and a coating disposed on the surface of the light-transmissive envelope or doped in the light-transmissive material. The light-transmissive envelope may comprise a light-transmissive material. The tungsten-halogen capsule can be positioned inside the light-transmissive envelope.
Claims17
A lamp having a rated wattage, the lamp comprising:
- a light-transmissive envelope comprising a light-transmissive material;
- a tungsten-halogen capsule housing a tungsten filament, wherein said tungsten-halogen capsule is housed inside the light-transmissive envelope;
- and
- a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, a concentration of the coating being arranged so that the lamp has a color rendering index of at least 50, the lamp has a correlated color temperature from 2400K to 2800K, and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage's lumen per watt wherein the coating decreases the correlated color temperature of the lamp and wherein the coating comprising about 67.5-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-2.44% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.
1 more element
A lamp having a rated wattage, the lamp comprising:
- a light-transmissive envelope comprising a light-transmissive material;
- a tungsten-halogen capsule having within said tungsten-halogen capsule a filament adapted to emit light wherein said tungsten-halogen capsule is housed inside the light-transmissive envelope;
- and
- a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, a concentration of the coating being arranged so that the lamp has a color rendering index of at least 50, reduces a correlated color temperature of light emitted from the tungsten-halogen capsule to between 2400K and 2800K, the lamp has a color point with (x,y) chromaticity coordinates on a CIE 1931 chromaticity diagram that lies below a black-body locus, and the color point with (x,y) chromaticity coordinates on the CIE 1931 chromaticity diagram lies at least 4 MacAdam steps distant from a color point of the filament-emitted light and wherein the coating comprising about 675-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-244% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.
1 more element
A lamp having a rated wattage, the lamp comprising:
- a light-transmissive envelope comprising a light-transmissive material;
- a tungsten-halogen capsule housing a tungsten filament, wherein said tungsten-halogen capsule is inside the light-transmissive envelope;
- and
- a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, the coating being arranged to increase a y coordinate of a color point of the lamp to greater than 0.40 for (x,y) chromaticity coordinates on a CIE 1931 chromaticity diagram and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage's lumen per watt and wherein a concentration of the coating colorant between 15% and 20% wherein the coating comprising about 675-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-2.44% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.
1 more element
Dependencies are inferred from the claim text.