gig-lamp

noun2

1. •
   [in the plural] (slang, old-fashioned) Spectacles.
2. •
   (no longer used, historical) Either of the lamps on either side of a gig carriage; a headlamp.

   • But once on the more secure purchase of the macadamised main road, their driver turned off his gig-lamps and let the passengers swell slowly into drowsy sleep as he set sail for distant Avignon. — 1985