Very high efficacy electrodeless high intensity discharge lamps

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866421

Johnson, Peter D ^[1]

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1. Schenectady, NY

An electrodeless arc lamp comprises an outer jacket hermetically sealing and thermally protecting an arc tube inside which has an upwardly convex bottom center section. The absence of chemically reactive electrode material makes it possible to use metal halides other than iodides. The tube contains chlorides, bromides or a mixture thereof of scandium and sodium in a nearly equimolar relationship in addition to mercury and an inert gas. Good color balance can be obtained at reduced reservoir temperature and with less power loss. Reduction in wall temperature makes it possible to attain longer lamp life.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4705987
• OSTI ID: 866421
• Country of Publication: United States
• Language: English

Related Subjects

efficacy
electrodeless
intensity
discharge
lamps
lamp
comprises
outer
jacket
hermetically
sealing
thermally
protecting
tube
inside
upwardly
convex
bottom
center
section
absence
chemically
reactive
electrode
material
makes
metal
halides
iodides
contains
chlorides
bromides
mixture
scandium
sodium
nearly
equimolar
relationship
addition
mercury
inert
gas
color
balance
obtained
reduced
reservoir
temperature
power
loss
reduction
wall
attain
life
center section
hermetically sealing
outer jacket
chemically react
power loss
intensity discharge
metal halides
active electrode
discharge lamp
inert gas
metal halide
electrode material
wall temperature
chemically reactive
lamp comprises
upwardly convex
thermally protecting
hermetically seal
discharge lamps
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