LEDs take time to heat up. If the duration of each pulse is short then the current can be higher.
Every LED has a maximum continuous current spec and a maximum pulsed current spec. The maximum duration of the pulses is also spec'd then the pulsed current can be higher than the continuous current and the heating will be the same.
Every LED has a maximum continuous current spec and a maximum pulsed current spec. The maximum duration of the pulses is also spec'd then the pulsed current can be higher than the continuous current and the heating will be the same.