| 主权项 |
1. A lamp, comprising:
one of a first connection portion and a second connection portion, wherein another one of the first connection portion and the second connection portion belongs to another lamp, wherein the first connection portion has a first electrode set, the second connection portion has a second electrode set, and the first electrode set and the second electrode set contact each other when the lamp and the another lamp are stacked each other, wherein the first electrode set comprises a first electrode and a second electrode, the second electrode set comprises a third electrode and a fourth electrode, and the second electrode is a ring-shaped electrode, wherein the first connection portion further has a ring-shaped trough, the ring-shaped electrode is located in the ring-shaped trough, and the fourth electrode is adapted to insert into the ring-shaped trough and contact the ring-shaped electrode. |
