| CPC F21V 19/02 (2013.01) [F21K 9/238 (2016.08); F21V 29/70 (2015.01); F21Y 2113/13 (2016.08)] | 20 Claims |

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1. A light-emitting diode (LED) lamp, comprising:
a case;
a power source, disposed in the case;
a heat sink, connected with the case, and disposed at an end of the case;
a light source, disposed on the heat sink, and electrically connected to the power source;
a lamp head, connected with the case; and
a rotating structure, disposed at a junction between the case and the heat sink, the rotating structure comprising a first rotating member and a second rotating member,
wherein the first rotating member is arranged facing to the second rotating member, the first rotating member comprises a first rotating face, the second rotating member comprises a second rotating face, the first rotating face is arranged facing to the second rotating face, there is an acute included angle a between the first rotating face and a sidewall of the case, there is an acute included angle b between the second rotating face and the sidewall of the case,
wherein, 15°≤a≤75°, and 15°≤b≤75°.
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