| Clue | Source | Date |
|---|---|---|
| A lighter of mine | ||
| Safe lighting developed for coal mines (4,4) | The Guardian Speedy | 24 Nov 2024 |
| Miner's illumination (4,4) | ||
| Miner's safety light | ||
| Miner's safety light | ||
| Safety light used in coalmines | ||
| First generally-used safety light in coal mines | The Guardian Speedy | 11 Dec 2016 |
| Mining illumination | The Guardian Speedy | 27 Nov 2016 |
| No night-light eclipses very old one used underground | The Times Cryptic | 20 Mar 2015 |