Philips Data Enabler

Conwy castle has a large installation of Philips eW Reach Powercore floodlights but interestingly, each flood has two external boxes connected in line with it, a "Data Enabler" and a "Data Enabler Aux".

Shown here is the Aux box which is externally identical to the main unit.

Edit: It seems these are intelligent controllers for switching and tuning the output of the floods and also controlling the colour on specific RGB floods. There are Ethernet and DMX versions.