Abstract: A heat sink casing comprising an elongated base having a seat portion for receiving at least one LED bar; and a back plate coupled to the base and provided with an interface to a base member of a traditional lighting panel is disclosed. The casing it self can act as heat sink for the LED bars mounted thereon and can therefore improve heat dissipation efficiency and reduce cost of each LED lighting fixture using the same. An LED lighting fixture using the above heat sink casing is also disclosed.

Abstract: A heat sink casing with magnetic interface is disclosed which can comprise an elongated base having a seat portion for receiving at least one LED bar; and a back plate coupled to the base and provided with a magnetic interface to a base member of a traditional lighting panel; wherein both the base and the back plate are made from thermal conductive material. Only one mounting step is required for retrofitting the present heat sink casing on the base member of the traditional lighting panel and the position of the mounted fixture can also be adjusted as required such that the LED lighting fixtures in the lighting panel can be configured into any layout.