Hi GTV68 - the classic Lumenition uses (as the name would suggest) an optical system to fire the coil - the points in the dizzy are replaced with a opto-coupler (infra-red LED and a photodiode with a slot between the two), and a disc with slots in it is fitted below the rotor arm. The disc passes through the slot in the optocoupler and cuts the beam as it rotates on the dizzy shaft.
The output of the optocoupler is sent to an external amplifier/FET switch that takes the place of the points.
This system has been around in various forms since the late '70s and has been fitted to competition and road cars with great success.
The Magnetronic system is not the same - it appears to be targeted at road use, and uses a rotating disc with magnets attached to trigger the coil. I believe that the FET switch is fitted inside the dizzy, so that apart from an additional 12V feed there is nothing to suggest you have electronic ignition.
It takes a finite time for a magnet to saturate a Hall effect sensor (if that is what they are using), so the pulse is less well defined than the purely optical system. Maybe thats why it is not being marketed with a performance bias...
In terms of its principle of operation (variable magnetic reluctance), Magnetronic is virtually identical to Alfas own electronic ignition distributor, and with the factory original you don't have to worry about where the control box goes, because the coil is integral with it
And its a proper coil too, not one of those open-frame jobs that don't like damp weather