| CPC G02B 6/0088 (2013.01) | 19 Claims |

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1. A through-type lamp, comprising:
a housing provided with a slot extending along an extension direction of the housing; and
an outer cover provided with a protrusion extending in an extension direction of the outer cover,
wherein the protrusion is clamped in the slot, so that the housing and the outer cover define a light chamber,
the outer cover comprises a light transmission part, and a first coupling part and a second coupling part separately coupled to the light transmission part; and
the protrusions are arranged at the first coupling part and the second coupling part, respectively.
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