Trying to move these lights

The cord can only go straight up to a receptacle, as long as necessary. If you want to rise to the ceiling and go in any direction to a box away from directly above the fixture, not allowed.

From the 2008 edition of the National Electric Code:


(C) Electric-Discharge Luminaires.
(1) Cord-Connected Installation. A luminaire or a listed assembly shall be permitted to be cord connected if the following conditions apply:

(1) The luminaire is located directly below the outlet or busway.

(2) The flexible cord meets all the following:
a. Is visible for its entire length outside the luminaire
b. Is not subject to strain or physical damage
c. Is terminated in a grounding-type attachment plug cap or busway plug, or is a part of a listed assembly incorporating a manufactured wiring system connector
In accordance with 604.6(C), or has a luminaire assembly with a strain relief and canopy having a maximum 152 mm ( 6 in.) long section of raceway for attachment to an outlet box above a suspended ceiling.

Make the cord? What does that mean? Are you going to plug it in, is it wired with a cord? The details in the answer will reflect the details in the question. Explain exactly what it is you want to know.