I am going to 12 volt on my Safari for better lighting, 12 volt electronic speedo, ect. I just got a H4, dual beam led headlight bulb. It is 16/25 watt and makes a lot of light. I can't seem to find an H4 conversion reflector for 4-1/2 inch lights so I am putting a 5-3/4 inch housing on and using this bulb. I have mounted it in a 7 inch to try it, and I was quite impressed. The bulb is available on ebay for 40 bux and the headlight shell assembly is 40-50 bux from our suppliers. There may be an issue of room for the bulb, because the bulb has a small fan built on the back inside an aluminum housing.
I don't have the bulb in front of me right now but I will get the dimensions of it in the next post so others may see if it will fit their application. When the housing comes I will post pictures also.
This light unit overcomes the focus limitations of LEDs with no reflector.