I am making a scary clown face entrance to my house. Above the face I am making a retro-like freak show sign with the letters FUN. The letters have 40w spherical bulbs (5,5 and 7 for FUN). I made a flicker extension cord with a fluorescent starter and it works great for a lamp but not for the letters. My guess is because the letters are a total of 200-280 watts each since the bulbs are daisy chained together vs the 60 watt bulb in the lamp. The question is, do you think additional starters can be inserted in the wiring between the bulbs or is there a better way to make the lights flicker?