light on (v.)
come across, meet with, chance upon
KL III.i.54 [disguised Kent to Gentleman, of Lear] he that first lights on him / Holla the other
TS I.i.110 [Gremio to Hortensio, of Bianca] if I can by any means light on a fit man to teach her
TS I.i.127 [Hortensio to Gremio] there be good fellows in the world, an a man could light on them
TS I.ii.165 [Gremio to Hortensio, of Lucentio as Cambio] I have lighted well / On this young man