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Investigation deals with LED's thermal management optimization in dependence of operating condition aided by application of infrared thermography. Thermal management calculations allow estimating temperature distribution on the LEDs, metal - core printed circuit boards (MCPCB) and heat sink but often real results may be different and experimental investigations are necessary. Good results are obtained using IR thermography with IR camera for the middle IR spectral region (8-13 Â¿m). Application of infrared thermography allows obtaining temperature distribution at real operating conditions. Thermal images analyzing allow obtaining real temperature distribution on the LEDs, solder points and different areas on the heat sink at different operating conditions. Results of this investigation allow adjusting proper LEDs' regime of operation in lighting system with maximum light output in dependence of ambient temperature conditions and to ensure long life (over 50000 hours) of the LEDs.