Optimising LED output without destroying them, factors, temperature
Learn how measure junction temperature.
One method is measure the forward voltage with 1mA in a oven and make a chart.
Then switch the Led from say 10 mA to test current and measure both voltages to determine a) junction temperature b) ESR of LED

Next you need to measure your heat sink thermal resistance.  Rja= ΔT/W   ['C/W].

Your design must reduce the Rja to not exceed 85'C at max ambient temperature.

Rule of thumb. If the LED burns your thumb, its' being driven too hard for your thermal design.

BTW Absolute Maximum Ratings only refer to pulsed current @ 25C using a 25'C cold plate.
This means you need the spec or tell us where you got it.