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Relevance of the structure of time‐resolved spectral output to light‐tissue interaction using intense pulsed light (IPL)

High quality IPLs can offer simple, safe and effective treatments for long‐term hair removal, removal of benign vascular and pigmented skin abnormalities, skin rejuvenation and acne treatments. Significant differences in clinical outcome have been recorded among different free‐discharge and constant current IPLs despite identical settings. We investigated the differences in optical output of 19 IPLs in normal clinical use in the UK to evaluate spectral output, energy density values and pulse structure and propose a correlation between light‐tissue interaction and spectral output as measured by time‐resolved photo‐spectrometry.