A lamp comprising a casing body, a light-transmissive partition plate, a reflector, a plurality of light-emitting devices,Circuit board and heat sink. The light transmissive partition and the casing body form an accommodation space. The reflector is disposed in the accommodating space. The reflector has a reflective surface and a mounting surface relative to the reflective surface. The light emitting device is disposed in the accommodating space. The light emitting device is located between the light transmissive partition and the light reflecting plate, and the reflective surface of the reflecting plate faces the light emitting device. The circuit substrate is disposed in the accommodating space. The circuit substrate is located on the mounting surface of the reflector, and the circuit substrate is electrically connected to the light emitting device. The heat sink is disposed in the accommodating space. The heat sink is located on the mounting surface of the reflector, and the housing body and the circuit substrate are thermally coupled to the heat sink. In addition, an aquarium kit containing this luminaire has also been proposed.一種燈具，其包括機殼本體、透光隔板、反光板、多個發光裝置、線路基板以及散熱裝置。透光隔板與機殼本體構成容置空間。反光板配置於容置空間內。反光板具有反光面以及相對於反光面的安裝面。發光裝置配置於容置空間內。發光裝置位於透光隔板與反光板之間，且反光板的反光面面向發光裝置。線路基板配置於容置空間內。線路基板位於反光板的安裝面上，且線路基板與發光裝置電性連接。散熱裝置配置於容置空間內。散熱裝置位於反光板的安裝面上，且機殼本體與線路基板熱耦接於散熱裝置。此外，一種包含此燈具的水族缸套件亦被提出。
