| 101/00 | Point-like light sources |
| 101/02 | Point-like light sources Miniature, e.g. light emitting diodes (LED) |
| 103/00 | Elongated light sources, e.g. fluorescent tubes |
| 103/02 | Elongated light sources, e.g. fluorescent tubes curved, e.g. ring-shaped |
| 103/025 | Elongated light sources, e.g. fluorescent tubes curved, e.g. ring-shaped U-shaped |
| 105/00 | Planar light sources |
| 111/00 | Light sources of form not covered by groups F21Y 101/00-F21Y 105/00 |
| 113/00 | Combination of light sources |
| 113/02 | Combination of light sources of different form |