This entity is obsolete; its use is discouraged and it may only exist/function in older engine branches.
light_glspot is a point entity available in all Source games.
Leftover from Half-Life 2's early development (1999-early 2001). Functionally identical to light_spot.
To do: If this entity isn't in-game, and isn't in the FGD, why is there a page for it?