Slash commands may be executed using either '/holylibrams' or '/hl',
though the latter may get overriden by other addons.

/hl mp5          Put Holy Librams! into efficiency (mp5) mode.
/hl hps          Put Holy Librams! into throughput (hps) mode.
/hl refresh <n>  Refresh Grace of the Naaru when it is under n seconds.