Related Clues:
- Light gas one mixed with nitrogen
- Strip brightener
- Las Vegas signs
- Attention-getting sign
- Bright light type in the big city
- "Open 24 hours" sign, perhaps
- Gas in a DINER sign
- Really bright
- Element seen in Las Vegas
- Store-sign gases
- Some Chryslers
- Broadway light type
- Chemical discovery of 1898
- Breaking news: energy — short of gas
- Helium-__ laser