| Answer | Crossword Clue |
|---|---|
| XENON | Gas used in flash lamps |
| NEON | Gas used in lamps |
| XENON | Gas used in arc lamps |
| ARGON | Gas used in incandescent lamps |
| NEON | Gas found in lamps |
| XENON | Gas in arc lamps |
| KRYPTON | Gas in fluorescent lamps |
| ARGON | Gas in incandescent lamps |
| ARGON | Gas in incandescent lamps, perhaps |
