High-pressure discharge lamp
View Patent ↗A high-pressure discharge lamp may include a bulb, which surrounds a discharge volume, wherein a fill which contains mercury and a noble gas from the group consisting of neon, argon, krypton, xenon on its own or in a mixture is accommodated in the discharge volume, wherein the fill contains Gd in halide form in order to produce a color temperature of at least 7500 K.
1. A high-pressure discharge lamp comprising:
an outer bulb, which surrounds a discharge vessel,
wherein a fill which contains mercury and a noble gas from the group consisting of neon, argon, krypton, xenon on its own or in a mixture is accommodated in the discharge vessel,
wherein the fill contains Gd in halide form in order to produce a color temperature of at least 7500 K,
wherein the coldfilling pressure of the noble gas is selected in the range from 30 to 300 hPa; and
wherein the high-pressure discharge lamp further comprises a total wall loading ranging from 10 to 21 W/cm 2 .
2. The high-pressure discharge lamp as claimed in claim 1 ,
wherein Gd is introduced in the form of GdI 3 and/or GdBr 3 .
3. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the fill contains, as further metal halides, rare-earth halides.
4. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the total metal halide fill quantity is at most 2 mg/cm 3 , based on the volume of the discharge vessel of the high-pressure discharge lamp.
5. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the content of Hg is selected in the range from 3 to 30 mg/cm 3 .
6. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the fill contains NaI and GdI3, wherein the proportion of GdI3 is greater than 15% by weight, wherein the discharge vessel of the high-pressure discharge lamp is surrounded by the outer bulb without a frame.
7. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the fill contains GdI3 and Cs halide, wherein the proportion of GdI3 is at most 15% by weight, wherein the discharge vessel of the high-pressure discharge lamp is held in the outer bulb by means of a frame.
8. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the metering of Gd halide lies in a region which is covered by a quadrilateral with the corner points 0.1 mg/cm 3 to 0.6 mg/cm 3 at 10 W/cm 2 and 0.25 mg/cm 3 to 0.75 mg/cm 3 at 21 W/cm 2 , wherein a further fill constituent is Na halide.
9. The high-pressure discharge lamp as claimed in claim 1 ,
wherein the metering of Gd halide lies in a region which is covered by a quadrilateral with the corner points 0.018 mg/cm 3 to 0.05 mg/cm 3 at 10 W/cm 2 and 0.035 mg/cm 3 to 0.063 mg/cm 3 at 21 W/cm 2 , wherein a further fill constituent is Cs halide.