It's CFL but my other light fixtures with CFL works just fine...Incandescent or fluorescent bulbs? If the first, you've a loose connection or more that needs correcting. If the latter, some CFLs require time to come to full brightness.
I just opened it up to check the connectivity and noticed this light fixture came with three wires and a ground.
One is connected to a live wire(black), another one is connected to a neutral wire (white), and a bare metal wire is obviously connected to a ground wire.
AND I can't figure out where this one last wire should be connected to. It's not labeled or anything and the light still turns on without this being connected.