Abstract: A high pressure alkaline metal discharge lamp includes a ceramic arctube and a discharge-sustaining fill. The fill contains rare gas and alkali metal, the alkali metal being cesium, rubidium, potassium or mixtures thereof. The fill is mercury free and cadmium free. The alkali metal vapor pressure during operation is at least 2 atmospheres.

Abstract: A discharge chamber for a lamp, the discharge chamber comprising a monolithic ceramic article having a main body defining an arc chamber and generally opposed leg members defining openings which may accommodate an electrode or electrode lead through. A method of making a ceramic discharge chamber comprising the steps of forming a mixture comprised of ceramic powder and a binder and injecting the mixture into a die and around a mold to form at least a main body of the discharge chamber.

Abstract: An arc lamp includes a light transmissive body having a first end and a second end. A first lead assembly is disposed along the first end and a second lead assembly is disposed along the second end. A first surface of rotation is formed on the first end and a second surface of rotation is formed on the second end that is different from the first surface of rotation. At least one of the first surface of rotation and the second surface of rotation is formed by pinching the body at a respective one of the first and second ends. A method of forming is also included.