A diagonally cuttable LED strip system comprising of a channel having a bottom and one or more side walls and a lens in which a primary circuit board having one or more LED diodes, one or more resistors, and one or more cutting lines resides therein. The one or more cutting lines include perpendicular and non-perpendicular cutting lines which divide the channel into cuttable increments at one or more angles. An extender is provided which attaches to the end of a channel to allow the cuttable increments of the channel to be extended, shortened, or a combination thereof.