Kenneth, what you saw were called swichbacks. It sounds like the guy had whats called a retrofit as well. We put HID projectors into housings that normally didnt have them, and some people put LED strips in there as well. Here are a few examples: Here are the actual LEDs used:
https://raptor-svt.freedommotorsport...hid_custom.jpg It's not cheap. My retro (I have a 1998) has well over $500 into it. The newer ones, like what you saw, with heads and fogs combo, could be well over $1,500 in lighting mods. Most of that is labor.