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Heat sinks are required for operation of all Classic (threaded) Light Plugz to draw heat away from the LED junction and disperse it to the ambient air. A heat sink should be screwed all the way to the top of the Light Plugz body so that it is flush with the lens cap. For sealed fixtures, there should always be contact between the heat sink and the fixture housing for maximum heat transference. 

Light Plugz users may select the appropriate heat sink from those offered by American Illumination, or may produce their own designs with approval . Those who wish do design their own heat sinks should consult American Illumination for specific guidelines.

American Illumination offers several different models of heat sinks based on size, shape and application.

HS6 Series heat sinks are wide and often better suited for the higher power Light Plugz models as well as sealed fixtures.
HS1 Series heat sinks have a smaller overall diameter and are better suited for narrow fixtures. 
Quick Release (QR) Series feature 4 set screws such that the heat sink can be split into two pieces for an alternative removal method.
Heat Sink Nuts are dual-purpose heat sinks to be used in conjunction with a bracket, plate or other fixture assembly and are generally not sufficient as standalone heat sinks. 
Pendant Series heat sinks are specially designed to provide both thermal management as well as structural support for pendant shades and screws.