A Hyperluminous Infrared Galaxy (HLIRG or HyLIRG) is a Galaxy emitting more than 1013 times solar Luminosity in the Far Infrared. A HLIRG can be considered a type of Luminous Infrared Galaxy, i.e., a galaxy with 1011 times solar luminosity in far infrared. A Ultraluminous Infrared Galaxy has 1012 times solar luminosity in far infrared.
Luminous Infrared Galaxy (LIRG)
Ultraluminous Infrared Galaxy (ULIRG)