Question about Kaiser Fototechnik Slimlite Plano

The specification of 1.5 hours refers to the operating time of the light panel at full power, not to the service life of the LEDs. LEDs actually have a service life of 10,000 to 100,000 hours, which means that they can function for a very long time if they are not constantly operated at full power. The specified operating time of 1.5 hours at full power is relevant for the battery operation of the light panel, not for the service life of the LEDs themselves.