Abstract: A power supply comprising a chopper circuit with an inductive filter element may drive a flashlamp to direct flashlamp radiation to a patient's skin. The waveform may have a generally constant current value and may be substantially independent of pulse width repetition rate and of pulse repetition rate. The flashlamp may be selected according to the type of treatment and the expected width of the treatment area. The wavelength of the radiation to be directed to a patient may be limited to a shallow tissue-penetrating, strongly melanin-absorbing wavelength spectrum, such as at most about 590 to 850 nm or at most about 590 to 700 nm. The chosen wavelength spectrum may be-within the UVA through UVB wavelength spectrum so to cause localized pigmentation in a patient's skin. The chosen wavelength spectrum may be a continuous wavelength spectrum.