What is thermal resistance of SMD7530 LED
Since the maximum junction temperature is 120°C and the maximum current is 150mA, you can guess that the thermal resistance is such that 95°C of rise occurs at 0.465W given the typical forward voltage is 3.1V, so about 204K/W. 

However that number is essentially useless since you don't know anything about the conditions under which that number is valid. It could be 20 x 20mm of aluminum core PCB, for example. If you assume that number and use FR-4 with modest amounts of thin copper, the LED life may be greatly foreshortened.