Crossword Genius

Lightbulb type (7)

Ross

I believe the answer is:

halogen

(Other definitions for halogen that I've seen before include "I too maybe" , "Element such as iodine" , "Chlorine, fluorine, bromine, iodine or astatine?" , "One of group of five elements (used in this type of lamp)" , "Element like, eg, fluorine" .)

I've seen this clue in The Wall Street Journal.
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