Very high efficacy electrodeless high intensity discharge lamps

Patent · Wed Dec 31 23:00:00 EST 1986

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
• 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

/313/
absence
active electrode
addition
attain
balance
bottom
bromides
center
center section
chemically
chemically react
chemically reactive
chlorides
color
comprises
contains
convex
discharge
discharge lamp
discharge lamps
efficacy
electrode
electrode material
electrodeless
equimolar
gas
halides
hermetically
hermetically seal
hermetically sealing
inert
inert gas
inside
intensity
intensity discharge
iodides
jacket
lamp
lamp comprises
lamps
life
loss
makes
material
mercury
metal
metal halide
metal halides
mixture
nearly
obtained
outer
outer jacket
power
power loss
protecting
reactive
reduced
reduction
relationship
reservoir
scandium
sealing
section
sodium
temperature
thermally
thermally protecting
tube
upwardly
upwardly convex
wall
wall temperature