To evaluate a 30 mm optic coupled with a 5 Watt High Dome Luxeon, I
made a custom head. The head is 1.5" in OD and is powered by a 700 mA
constant current BadBoy supplied by an E2 power pak:
Some details below:
Above, the beam shot on the left was adjusted in PhotoShop with reduced intensity (middle)
and then increased intensity (right). The Optic consists of two elements, a ball and tube. The
ball projects a larger and dimmer image of the die of the LED. This is the square pattern
and you can make out the dark segments of the die "grid". The tube uses TIR to concentrate
the light in a moderately tight round beam. There is a noticeable small null right in the center
of the beam. This null grows proportionally with the beam as the target gets further from the
light. With a single sample of LED and optic, it is uncertain if this artifact is typical.