I just got two Current USA CF
bulbs. They are 18 watt, twin-tube, SunPaq Dual Daylight 6700°K
. They rattled when I took them out of the box - kind of like an incandescent bulb that is burned out and you shake it and hear the rattle. I could definitely hear that something was moving around in the bulbs - both of them. They turned on OK and both tubes lit. Has anyone else had this experience?