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plural HMIs
(technology) Initialism of human-machine interface.
Initialism of hydrargyrum medium-arc iodide. (a kind of lamp) quotations examples
A regular package here would give you six pieces of 1K tungsten lights, ten pieces of inky-dinkies, one HMI if you're lucky.
2015, Harriet Margolis, Alexis Krasilovsky, Julia Stein, Shooting Women: Behind the Camera, Around the World, page 151