I cannot help exactly, but it looks a bit like this one:
http://www.ebay.co.uk/itm/2x-21-SMD-LED-Car-70mm-Ring-Angel-Eyes-light-White-1-5W-/250793641841
which seems to require 1.5W at 12V
You could put a resistor in series and try to wire back to the main 19V power supply
I connected a single LED through a resistor to the fan wires on the extruder head:
http://www.thingiverse.com/make:45421
my setup only comes on when the fan is on, but it might not be enough to power your LED ring, you'll have to check the Ultimaker schematic.
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LePaul 357
Those are very popular here with the remote controlled airplanes, namely the ducted-fan jets. They can turn it on and it emits red/orange light, mimicking the afterburner (re-heat in UK verbage) of a jet fighter.
I'm not sure where on the Ultimaker you could place that. However there are numerous fuse blocks/12v battery sources you could wire in.
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