Here we are using the MR355 Pulse Timer to simulate a Light House Beacon. 
 In the first wiring diagram the High Bright LED is switched ON & OFF by adjusting the two pre-sets on the timer board. The LED is wired to the Normally Open contact of the relay via a 1K resistor.
In the second wiring diagram a second dropping resistor is introduced & is connected to the Normally Closed contact of the relay. This gives the effect of the afterglow you often see with lighthouses.