Patent ID: 7686470

Claim:
A ceiling light fixture adapted to interchangeably use various lamp assemblies, comprising: a rectangular base housing forming at least one elongated channel having a trapezoidal cross section, said channel having a bottom wall forming an elongate slot, said bottom wall of said channel forming on a back side thereof a circumferential raised mounting frame and a plurality of barbs extending from said mounting frame, said bottom wall of said channel being provided in each lengthwise end with respect to said elongate slot with a lamp tube end seat fitting hole; a light-transmitting cover panel corresponding to said elongated channel, said cover panel having edge plates forming tenon fitting structures for closing an opening of said elongated channel; and a lamp assembly carrier board removably received in said mounting frame and clamped and secured by said barbs to have a light source exposed through said elongate slot for irradiating light toward side walls of said channel, said lamp assembly carrier board comprising a wiring board having a surface forming bores for respectively receiving and fixing therein a plurality of twisting type sockets in a rotatably fitting manner, light-source and rectification circuit board assemblies having the same number as said twisting type sockets and each being a T-shape formed by fitting and soldering separate vertical and horizontal plates together, and a heat dissipation board forming therein coolant passages and comprising a plurality of heat dissipation fins arranged on a back thereof, which are stacked together; wherein each of said light-source and rectification circuit board assemblies is provided on a tip of said vertical plate thereof with electrical conduction faces corresponding to electrical contacts of and fitting into said twisting type sockets and is provided, on said horizontal plate that is exposed outside said twisting type sockets, with a light-emitting diode to serve as the light source, and wherein the heat dissipation board has opposite flanges extending laterally and positioned on said wiring board and clamped and secured by said barbs; wherein the ceiling light fixture selectively allows a lamp tube end seat to be fit and retained in the lamp tube end seat fitting hole to set and fix a lamp tube of a second lamp assembly below the elongate slot to realize interchangeable use of the ceiling light fixture with different lamp assemblies.