Put 4x6 LED headlight into amazon search and you will see dozens of options. Most will come from China, so you can take their DOT approval with a grain of salt.
If you drive in the early winter, one of the issues with some of the LED headlamps is they don't create enough heat to melt off any ice that might accumulate. Some will have an extra wire for heat.
I have worked with some of the other sizes in military LED lighting, and as a system they work out pretty good. But when retrofitting, there are some tricks and traps. I have been working out one of those now.
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