| CPC F21V 23/06 (2013.01) [F21S 2/005 (2013.01)] | 22 Claims |

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1. A lamp unit, comprising:
a lamp panel having a light-emitting surface and a back surface opposite to the light-emitting surface, wherein a cavity formed by the light-emitting surface and the back surface is provided with light-emitting elements and a plurality of electrical contact points that are electrically connected to the light-emitting elements, and a plurality of openings are formed in the back surface at positions corresponding to each of the electrical contact points, so as to expose the electrical contact points; and
a mounting unit configured to be detachably mounted on a back surface center portion of the back surface and used for mounting the lamp unit on a predetermined position, wherein the mounting unit is provided with a plurality of connection positions corresponding to the openings in the back surface center portion, and the connection positions are used for forming an electrical connection with another lamp unit.
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