Intense Pulsed Light (IPL) sources produce broad wavelength spectra and relatively long pulses. The spectral distribution and intensity profile of a pulse depend on, and thus can be controlled by, an electric current via a flash lamp. This adds new dimensions to IPL technology, providing considerable improvement in both safety and efficacy of IPL treatments by designing target-specific pulse shapes. Theoretical considerations and computer simulations have shown that the current-controlled pulses may be 20-30% more safe/effective than previously-used IPL pulses. Clinical results confirm the conclusions of these simulations.