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US 8,427,052 B2Granted
Metal halide lamp with oversaturated red
AssigneeKoninklijke Philips Electronics N.V.
InventorsPetrus Johannes Mathijs Van Der Burgt, Vincent Fischer, Timo Borlet
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Abstract
A metal halide lamp includes a ceramic discharge vessel that encloses a discharge space which accommodates two electrodes and contains a salt filling. The salt filling includes sodium iodide, thallium iodide, calcium iodide, cerium iodide, and barium iodide as a colorpoint stabilizing additive. The salt filling further includes calcium iodide and thallium iodide, and substantially no sodium iodide. The salt filling further comprises mercury iodide.
Claims16
A metal halide lamp comprising:
- a ceramic discharge vessel enclosing a discharge space;
- electrodes located at least partially in the discharge space;
- and
- a salt filling in the discharge space, where the salt filling comprises calcium iodide and thallium iodide, and substantially no sodium iodide, and further comprises mercury iodide so that a saturated red rendering R*9 of light output of the lamp is at least 200.
1 more element
Dependencies are inferred from the claim text.