No you need to get enough LED's to draw 42 watts per flash or at least 30 watts, well actually i think someone had a thread in here about adding a resistor or 2 to make the flash speeds correct
Great for sidelamps and tail lamps but cack for indicators
nippy norman - his sets have a resistor built into the back that prevents this problem.. maybe you should give him a ring and see if he can supply one you can retro fit.