I have been admiring all the work that has gone into making these LED lamps, well done.
My expertise may now be out of date
however I have been puzzled by the use of Voltage regulators as LEDs rely on current control for optimum use. Unless there is an internal resistor, an external one (or a current regulator), should be used to limit the current. (IMHO)
See:
Light Emitting Diodes (LEDs)
Powering Light Emitting Diodes (LEDs)
Here is the spec for one range of high output LEDs
