Constant current buck led driver
I would do a simple P=I*V calculation to find the power dissipation of the LED. The voltage will be fairly constant with some ripple from the switcher.

If the average LED current is 160mA, the voltage will be ~2.25V. The power would then be 0.160A*2.25V=360mW

For 200mA and 2.35V it would be 470mW


Source: https://media.osram.info/media/resource/hires/osram-dam-4134009/asset_pdf_3587997.pdf