*This article is in reference to the 2013 and earlier generation LED lighting with replaceable diodes*
There is a metal tool that is included with the replacement diode that allows you to unscrew a metal retaining ring on the front of the light. Remove the lens, gasket and then remove and replace the small diode circuit board. Note that the diode circuit board is "notched" and needs to go into the fixture in a certain direction in order to make electrical contact. The diode will not go in unless it is in the proper notched orientation.