| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | L-Plan Lichtplanung | Light engineering | 7 |
| 2 | L'Observatoire International | Light engineering | 5 |
| 3 | Lam Partners, Inc. | Light engineering | 17 |
| 4 | Lang Lighting Design, Inc. | Light engineering | 2 |
| 5 | Laservision Australia | Light engineering | 13 |
| 6 | LEOX Design Partnership | Light engineering | 2 |
| 7 | Licht 01 Lighting Design | Light engineering | 2 |
| 8 | Licht Kunst Licht AG | Light engineering | 1 |
| 9 | Licht Kunst Licht AG | Light engineering | 59 |
| 10 | Licht-Lux-Lumen GbR | Light engineering | 1 |
| 11 | Licht-Technik Vertriebs GmbH | Light engineering | 11 |
| 12 | Lichttechnische Planung | Light engineering | 1 |
| 13 | LichtVision GmbH | Light engineering | 0 |
| 14 | Light Bureau Ltd. | Light engineering | 1 |
| 15 | LIGHTDESIGN INC. | Light engineering | 1 |
| 16 | Lighting Associates | Light engineering | 13 |
| 17 | Lighting Design Alliance | Light engineering | 17 |
| 18 | Lighting Design Alliance | Light engineering | 1 |
| 19 | Lighting Design Alliance | Light engineering | 1 |
| 20 | Lighting Design International | Light engineering | 2 |