The headlight on the Speedie is pathetic . Fortunately, they use the good old standard bulb (7" H4). I just recently replaced it with Hella E-code unsealed bean with a 80/100 watt bulb. It is non-DOT so just be aware of it. I have been using E-code lights for a long time. It is much brighter and safer because it has a sharp horizontal cut off. It does not blind the on coming traffic likes others.
I ordered one that has City Light. So I need to solider the old plug from the OEM light to the new Hella light.
I turned on the light and had it run for a while. I checked the wires, they did not get hot at all. So there is no need to install a reply for the higher wattage bulb.

You can opt for 90/130 watt too.