Dont wait for the light to go off. The idea is to start steaming just before it goes out so the element maintains the best steam pressure for you. To start with time how long it takes for the light to go off once you know the time you can commence steaming a bit before. Dont forget to release water to create headspace.
Have a read of the Id really like to PID my Silvia thread at the start of this section, displaying the temp makes steaming easy, you still have to wait for it though.