Ultraviolet and visible filter for ceramic arc tube body

A UV-attenuating discharge vessel for an arc discharge lamp comprising:

• an arc tube body which defines a discharge space for receiving, a metal halide fill the body being constructed from a ceramic material doped with a UV-attenuating additive, the UV-attenuating additive being at a concentration of less than about 5000 ppm.

A UV-attenuating discharge vessel for an arc discharge lamp comprising:

• an arc tube body which defines a discharge space for receiving a metal halide fill, the body constructed from a ceramic material selected from the group consisting of polycrystalline metal oxides and monocrystalline metal oxides and being doped with a UV attenuating additive, the arc tube body further comprising magnesia at a concentration of about 400-1500 ppm.

A UV-attenuating discharge vessel for an arc discharge lamp comprising:

• an arc tube body which defines a discharge space for receiving a metal halide fill, the body being constructed from a ceramic material doped with a UV-attenuating additive, the UV-attenuating additive including an oxide of a lanthanide series element selected from the group consisting of cerium, europium, lanthanum, dysprosium, neodymium, and combinations thereof.

An arc tube body for an arc discharge lamp which defines a discharge space for receiving a metal halide fill, the body being constructed from a ceramic material doped with a UV-attenuating additive by a process which includes:

• infiltrating a dopant solution into a porous arc tube body, the dopant solution including a compound which is convertible to the UV-absorbing additive;
• and
• converting the compound to the UV-attenuating additive.