Without being able to reference (I believe) The Hobbit, at the moment, there is a passage making reference to Sting and other elvish swords forged in Gondolin, as glowing in the presence of orcs. I presume this includes all servants/creatures of Morgoth. Which would therefore include Orcrist and Glamdring. I think, that it was Elrond, when Thorin & co. were in Rivendell, who identified these blades as being of Westernesse and their names.
Orcrist, placed on top of Thorin Oakenshields tomb, would glow when enemies were approaching the Lonely Mountain.
Also, PJ seems to have either overlooked the fact that Glamdring should also glow when near orcs, or chose to ignore it.
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