Koninklijke Philips Corporation N.v.

Ralph Kecke

Hans-Alo Dohmen

Juergen Flechsig

Martin Polster

The invention describes a lamp (A,B,C,D) comprising a glass envelope () enclosing a light generating means (), and an axially and/or circumferentially graded absorption coating (A,B,C,D) applied to a surface of the glass envelope (), wherein the graded absorption coating (A,B,C,D) exhibits a smooth transition in a transition region (A,C,D) from a first coated region (A,B,C,D) on the glass envelope () to a second coated region (A,B,C,D) on the glass envelope (). The invention further describes a lighting assembly () comprising a lamp according to any of claimstoand a reflector () for collecting and shaping any light passing through the graded absorption coating (A,B,C,D) of the lamp (A,B,C,D). The invention also describes a method of manufacturing a lamp (A,B,C,D) comprising a glass envelope () enclosing a light generating means (), which method comprises applying an axially and/or circumferentially graded absorption coating (A,B,C,D) to a surface of the glass envelope () such that the graded absorption coating (A,B,C,D) exhibits a smooth transition in a transition region (A,B,C,D) from a first coated region (A,B,C,D) to a second coated region (A,B,C,D).

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Plauen, Germany

Ralph Kecke