This is the "secret" keys that is burned into all Zigbee lighting products - Zigbee is a low energy mesh network. You need this key to develop you own clients

This is the "secret" keys that is burned into all Zigbee lighting products - Zigbee is a low energy mesh network. You need this key to develop you own clients for existing lights on the market. It is only given to paying members of the Zigbee interest group to use in tested devices