Which halogen is used in halogen lights? Is there more than one used
or is there a specific one used for all?
Typically bromine and iodine. There was a very nice "Working Knowledge"
feature in a Scientific American from a year or two ago that explained how
halogen lights work.
Richard E. Barrans Jr., Ph.D.
Assistant Director, PG Research Foundation
Darien, IL USA
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Update: June 2012