Gas-discharge lamp
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United States of America Patent
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Jun 16, 2015
Grant Date -
Mar 21, 2013
app pub date -
May 18, 2011
filing date -
May 26, 2010
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Abstract
The invention describes a gas-discharge lamp (1) comprising a vessel (5), which vessel is partially coated with an essentially rectangular stripe (Sv) arranged circumferentially on a surface of the vessel, and wherein a first long side (14) of the stripe is situated close to a base (6) of the lamp, and the width (wv) of the stripe is such that a first angle (αv2) subtended at a lamp center between a radius (r) and a point on the first long side (14) of the stripe comprises at most 55°, and a second angle (αv1) subtended at the lamp center between the radius and a point on a second long side (15) of the stripe comprises at most 50°. The invention also describes a reflector for a lamp, comprising a reflective interior surface realized to deflect light originating from the lamp outward to give a specific beam profile with a bright/dark cutoff line and a shoulder, and wherein the lamp, in particular a lamp as described above, is positioned horizontally in the reflector, and wherein the reflective interior surface comprises at least one beam-shaping region realized to deflect a portion of the light emitted from the lamp between 7.5° and 15° below a horizontal plane, at a specific region within the beam profile.
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