H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/10, 313/136
H01J 61/35 (2006.01) C09K 11/77 (2006.01) H01J 61/12 (2006.01) H01J 61/44 (2006.01)
Patent
CA 1165801
9 48,313 ABSTRACT OF THE DISCLOSURE A improved metal halide lamp with incandescent lamp characteristics. The lamp is provided with an arc tube having a discharged-sustaining filling comprising a predetermined amount of mercury such as 12.5 mg./cm of spacing between the operating electrodes plus a small pressure of inner inert ionizable gas such as argon at about 25 torrs, and predetermined amounts of sodium iodide from about 6.5 to 18.0 mg./cm of spacing between the operating electrodes, tin iodide from about 0.3 to 1.0 mg./cm of spacing between the operating electrodes and thallium iodide from about 0.1 to about 0.6 mg./cm of spacing between the operating electrodes. The lamp is provided with an outer envelope carrying on the inner surface thereof a luminescent coating comprising a mixture of predetermined amounts of strontium chloroapatite phosphor activated by divalent europium preferably from about 0.2 to 0.8 mg./cm2 of coating and yttrium vanadate phosphate phosphor activated by trivalent europium from about 1 to 2.5 mg./cm2 of coating in predetermined relative weight proportions of about 0.05:1 to 0.4:1. The preferred relative weight proportion being 0.2:1.
355831
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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