USBuck driving two 1W LEDs in parallel w/ PWM imput 

USBuck running at 5.02V (from USB), driving a CREE XM-L U2 (taller) and 1W Luxeon (shorter) at 1A. Simple closed-loop script (PWM) run on a Arduino ProMicro (SparkFun): 20%, 40%, 60%, 80%, 100%, 20%...