Modified spectrum lamp

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.

What is claimed is: 
     
         1 . A lamp having a rated wattage, the lamp comprising:
 a light-transmissive envelope comprising a light-transmissive material;   a tungsten-halogen capsule 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 3200K, 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 the color point with (x,y) chromaticity coordinates on the CIE 1931 chromaticity diagram that lies at least 4 MacAdam steps distant from a color point of an uncoated lamp having the rated wattage.   
     
     
         2 . The lamp of  claim 1 , wherein the tungsten-halogen capsule comprises:
 a tungsten filament;   an inert gas; and   a halogen gas.   
     
     
         3 . The lamp of  claim 2 , wherein the halogen gas is an iodine or a bromine. 
     
     
         4 . The lamp of  claim 1 , wherein the lamp has the correlated color temperature of less than 2850K. 
     
     
         5 . The lamp of  claim 1 , wherein the rated wattage is 72 watts. 
     
     
         6 . The lamp of  claim 1 , wherein the rated wattage is 42 watts. 
     
     
         7 . The lamp of  claim 1 , wherein the lamp has the color rendering index between 97-100. 
     
     
         8 . The lamp of  claim 1 , wherein the lamp produces between 1100-1500 lumens. 
     
     
         9 . The lamp of  claim 1 , wherein the coating colorant comprising aluminum silicate pigment, titanium dioxide, CrSn pink, and red iron oxide. 
     
     
         10 . The lamp of  claim 1 , wherein the coating comprising precipitated silica, aluminum silicate pigment, titanium dioxide, CrSn pink, red iron oxide, and coupling agents. 
     
     
         11 . The lamp of  claim 1 , wherein the coating comprising about 66.75% precipitated silica, 30% aluminum silicate pigment, 1.4% CrSn pink, 0.2% red iron oxide, and 1.68% coupling agents. 
     
     
         12 . The lamp of  claim 1 , 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. 
     
     
         13 . The lamp of  claim 1 , wherein the concentration of the coating is arranged so that the lamp has a color rendering index of at least 50, the lamp has a correlated color temperature from 2500K to 3000K, 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. 
     
     
         14 . The lamp of  claim 1 , wherein the concentration of the coating is arranged so that the lamp has a color rendering index of at least 50, the lamp has a correlated color temperature from 2500K to 3200K, 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. 
     
     
         15 . A lamp having a rated wattage, the lamp comprising:
 a light-transmissive envelope comprising a light-transmissive material;   a tungsten-halogen capsule 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 3200K, 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 a clear lamp having the rated wattage.   
     
     
         16 . The lamp of  claim 15 , wherein the coating colorant comprising aluminum silicate pigment, CrSn pink, and red iron oxide. 
     
     
         17 . The lamp of  claim 15 , wherein the coating comprising about 66.75% precipitated silica, 30% aluminum silicate pigment, 1.4% CrSn pink, 0.2% red iron oxide, and 1.68% coupling agents. 
     
     
         18 . The lamp of  claim 15 , 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. 
     
     
         19 . The lamp of  claim 15 , wherein the concentration of the coating is arranged so that the lamp has a color rendering index of at least 50, the lamp has a correlated color temperature from 2500K to 3200K, 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. 
     
     
         20 . A lamp having a rated wattage, the lamp comprising:
 a light-transmissive envelope comprising a light-transmissive material;   a tungsten-halogen capsule 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 colorant between 15% and 20% wherein the coating comprising precipitated silica, aluminum silicate pigment, titanium dioxide, CrSn pink, red iron oxide, and coupling agents wherein the 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 2500K to 3000K, and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage lumen per watt and the color point with (x,y) chromaticity coordinates on the CIE 1931 chromaticity diagram that lies at least 4 MacAdam steps distant from a color point of an uncoated lamp having the same rated wattage lumen per watt.