A removable LED track light device has a plurality of LED light-units that fit within track means. At least one LED element(s) fits within the LED light-unit's geometric construction such that electrodes of the LED light unit are connected via conductive mean, resilient conductive means, contact means, to bus means that supply electric signal from an AC or DC power source, with circuit means, switch means, sensor means, timer means, and/or control means being included to provide desired light functions for illumination. The LED-units have a geometric construction and space to allow element(s) to be fixed in position or incorporated with reflector means. The LED light-units may also be incorporated bracket means to arrange the LED element assembly away from the LED light-unit base. Hanging means or another electric device also can be added onto the LED light-unit or LED light device to provide even more practical extra functions.