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To make a light flash on random time on blender game engine, use the game logic, and connect the light to a custom python script, with this content:

import bge, random, math

obj = bge.logic.getCurrentController().owner

print ("here")

if math.fabs(obj["intensity"] - obj.energy) < 0.2:
    flash = random.randint(0,300) < 1
    print("Flash = "+str(flash))
    if flash:
        obj["intensity"]  = random.randint(0,5)/10
        
    else:
        obj["intensity"]  = random.randint(10,11)/10
  
obj.energy = obj["intensity"] 
next_step = obj.energy+0.3


print("light change"+str(obj.energy))