| Clue | Source | Date |
|---|---|---|
| Illuminating tubing (5-8) | Puzzler | 16 Aug 2024 |
| Output of fluorescent tubes, in Britain | Wall Street Journal | 25 May 2021 |
| One problem splitting thread is such illumination | The Telegraph Cryptic | 06 Mar 2019 |
| I pledge to fill train, providing illumination | The Telegraph Toughie | 29 Mar 2017 |
| Insulting about excursion that Tube provides? | The Times Cryptic | 14 Aug 2015 |