1) Diner sign substance 2) It glows in Vegas 3) It may glow in the dark 4) Light medium 5) Light stuff 6) Light substance 7) Motel sign filler 8) Sign stuff 9) Substance in some signs 10) Tubular sign filler 11) Vegas light source Found on https://www.crosswordclues.com/clue/neon-gas
1) Diner sign substance 2) It glows in Vegas 3) It may glow in the dark 4) Light medium 5) Light stuff 6) Light substance 7) Motel sign filler 8) Sign stuff 9) Substance in some signs 10) Tubular sign filler 11) Vegas light source