How our clusters are made. This is a Cluster-32 showing the inner diameter of 2", with an outer diameter of 2 1/4". The bluish 1/8" lip is for easy horizontal and vertical installations with a tiny bit of adhesive and are part of all disks from 1.5 inch and larger. Back is fully potted on all clusters as shown by the white 2" diameter area.
The LEDs sit on the disk face surface. When the potting material is poured into the back side cavity, the potting material seals the LED's pins or wire leads, thus becoming weatherproof. Theoretically, they are also waterproof to 10 feet but we do not recommend unenclosed clusters for that usage.