* One of the tubes is 10,000K and the other is Actinic 03! * The perfect solution for any hobbiest who has only 1 socket, and wants both types of light in their tank. * 10,000K color is high intensity "ice white" light. * Actinic 03 is real actinic 03 with light emitting peak at 420nm. * German style straight pin (GY10Q). * 9" Overall legth.