Abstract Color-corrected high-pressure mercury-vapor lamp provides good color rendition of illuminated objects, and especially good color rendition of flesh tones. The lamp utilizes a particular phosphor coating principally comprising a two-component blend. One of the phosphor blend components provides an emission in the shorter wavelength region of the visible spectrum peaking at from 440 nm to 470 nm, and an example of this component is a strontium chlorophosphate having an apatite structure and activated by a divalent europium. The other phosphor component provides an emission in the longer wavelength region of the visible spectrum peaking at from 605 nm to 630 nm, and an example of this phosphor component is yttrium phosphate-vanadate activated by tervalent europium. For the foregoing examples, the relative weight ratio of the one phosphor component to the other phosphor component is from 0.05:1 to 0.4:1.
The lamp as specified in claim 1, wherein said one phosphor has its peak of emission at about 450 nm, and said other phosphor has its peak of emission at about 620 nm.
Claim 2
Dependent Claim
152 words
A color-corrected high-pressure mercury-vapor lamp which provides good color rendition of illuminated objects, and especially good color rendition of human flesh tones, said lamp comprising an arc tube which emits both visible and ultraviolet radiations, and an outer envelope surrounding said arc tube, a phosphor coating carried on the inner surface of said outer envelope, said phosphor coating substantially comprising two phosphor components, one of said phosphor components is a matrix of chlorapatite or bromapatite of alkaline-earth metal wherein the alkaline-earth metal is at least one of calcium, barium and strontium, the halogen is at least one of chlorine and bromine, and divalent europium is present in an activating proportion, and the other of said phosphor components is a matrix of yttrium vanadate or yttrium phosphate vanadate with an activating proportion of tervalent europium, and the relative weight ratio of said one phosphor to said other phosphor is from 0.05:1 to 0.4:1.
Claim 3
Dependent Claim
25 words
The lamp as specified in claim 3, wherein the relative weight ratio of said one phosphor to said other phosphor is from 0.1:1 to 0.3:1.
Claim 4
Dependent Claim
23 words
The lamp as specified in claim 3, wherein the relative weight ratio of said one phosphor to said other phosphor is about 0.2:1.
Claim 5
Dependent Claim
16 words
The lamp as specified in claim 3, wherein said phosphate matrix is strontium or calcium chlorapatite.
Claim 6
Dependent Claim
24 words
The lamp as specified in claim 3, wherein said phosphor is coated to a weight of from 1 to 8 mg/cm2 of coated surface.
Claim 7
Dependent Claim
22 words
The lamp as specified in claim 3, wherein said one phosphor and said other phosphor are admixed as a generally uniform coating.
Claim 8
Dependent Claim
20 words
The lamp as specified in claim 3, wherein said one phosphor and said other phosphor are coated as separate layers.