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MaxFlex
MaxFlex Sink
MaxFlex mounted on 'reach around' sink with both gold pad contact area underneath (heat from switcher IC) and top mounted inductor in contact. Works like a charm 
Thick wires are (likely overkill) for power in, thin are control and to LEDs which are lower current.
Taskled MaxFlex
This is a TaskLED MaxFlex boost driver. It's about 25mm diameter and needs about 7mm depth to clear all components on both sides.
The lump of aluminium next to it (is 3mm thick, BTW) will be glued (with Artic Silver Thermal Epoxy) to the aluminium that the LEDs will be glued to (also with Artic Silver). The MaxFlex has a temperature sensor that reduces LED current if things get too hot - very nice touch.