Yeah, IIRC they are supposed to act as DRLs and mimic the headlights on newer vehicles. They've got tail lights like that for them as well. I'm torn on the look. On the one hand I kind of want to update my headlights to something newer (the 99 is getting a facelift soonish) on the other hand I kind of think that on most of these LED strip looks out of place in a light that wasn't designed for them. I say that while my Kia has similar in the taillights, but those actually look like some thought was put into the design (and they are OEM, but not first year OEM), where as these look like it was just squeezed in there without much thought to the design.
I've been torn between 01-11 headlights and 06+ corners and going with something aftermarket like these, which IMO have a little more thought put into the design.
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Heck at this point I'm still conflicted on how to proceed with the facelift. Buy all new, or scrounge used where I can. I've found a header panel locally for $65 with all the hardware and the headlight light retainers, but I'd still need to source a grille. A grille and header panel combo off the interwebz is around $200 with new headlights, but I'd have to scrounge up a lot of small parts like hardware and headlight retainers.
That's what I did to my Ranger today (and most days). Spent too much time thinking about the best way to proceed.