Historical clue formulations

• Certain electric bulbs, in brief — 2025-10-13
• Energy-efficient bulbs, for short — 2025-08-01
• Display options, in brief — 2023-04-26
• Some arena illumination, for short — 2023-03-31
• Certain bulbs, in brief — 2023-02-21
• Many modern Christmas bulbs, in brief — 2022-10-24
• The lights in fairy lights — 2022-10-16
• Energy-efficient illumination sources, for short — 2021-03-22
• Watch readouts, for short — 2015-06-23
• Watch readouts, briefly — 2014-05-28
• Display options, briefly — 2014-02-01
• Some indicator lamps, briefly — 2013-06-07
• Some readouts, briefly — 2011-11-09
• Watch readouts, for short — 2010-11-17
• They're often seen on scoreboards, for short — 2010-03-13
• Digital-display types — 2003-08-03
• Watch readouts, briefly — 2000-01-16
• Digital displays — 1997-09-20
• Digital displays — 1994-03-26