I don't know if you are familiar with cable lighting but I use often in vaulted ceiling applications These are 2 examples of installs The company I use is Tech lighting and this system is called Kabel

@Patricia Colwell Consulting. Thank you. Admittedly I don’t love the look of the steel cables, as I’m going for more of a traditional look. Either way, I need someone to specify which equipment to install in which location. Do lighting designers work remotely?

Thank you RL Relication LLC. Definitely an approach worth thinking about.

There are 5 trusses, 4 of which currently have downward pointing track lighting. Each existing track is about 6ft long, but the entire length of a truss is about 25ft long. So there are some real dark spots, both above the tracks (above 8ft until the peak 15ft ceiling) and in areas where there are no tracks. The existing down lights illuminated the space as the previous owners used it. But since I am changing the furniture plan, I need some of the dark spots illuminated.

Can the existing 6ft tracks be replaced with new tracks that are as long as 25ft?

Here is a photo showing more of the ceiling.

You have a few options to light the space and ceiling.

Uplighting should be a must. Using spots, whether mounted on top the timber bottom chord or beside the timber on a track, would be just that - "spotty" - non-uniform across the whole space and intrusive muddling up the aesthetic with how many spots you would need. Another method is to install a linear light along the top of the entire timber bottom chord - you would want a low-profile lumenaire with low lumens to not hot spot the vertical timber web chords (e.g. tape light in a channel), so that way you do not see them from below (your bottom chord is close to head height and you have the stair overlooking). The last method, and in this case might be the best choice, would be a directionally-adjustable wall-wash lumenaire between each timber truss. Mounted in the existing "cove" (or against the wall) you can hide it with a valance if need be or choose a fixture with a cover housing.

Here would be a generic example fixture to illustrate the wall wash:

Your best bet, without an architect or electrical engineer spec'ing the lumenaire (which would be a very pricey materials list anyway), would be to go to a lighting store. The fixture brand and cost will be determined by what they can obtain or have accounts with.

As far as downlighting your spaces, that is trickier. It depends on how permanent the spaces are (e.g. will your dining table never move or change size?) and how much you want to have the fixtures "accentuate" or "disappear" from sight (e.g. bulky or slim pendants, ceiling fans, wagon wheel).

Thank you 3ontheTree. I didn’t know about wall wash lumenaire fixtures. In the research I have done, I have read that “washing the wall” with light is a preferred method of lighting space.

Yes you can run long runs of track, and switch all the heads to low wattage LED in a warmer tone maybe 3k or so. if you are changing the furniture plan you need to show us what that is. you wouldnt need to go end to end. IDK what you plan to do for switching, or if you have had an electrician out, but I would want 2 circuit track. so you can just have the up lights on vs all of them all the time. id really need to see your new floor plan.

my ideal, but most expensive would be rail lighting as it is more slender, and has better design options. also here is somewhat of a wall wash too

RL Relolcation LLC, here is the furniture plan we are working on. (There may be some tweaks, but this is close.) I sketched in the approximate location of the beams.

You have a lot of options, I would assume you will need to get electrical plans going for some of the changing elements anyway. seems you have plotted lights over the island for example. Curious if you have had an electrician or contractor out, this might be a case of really re thinking it. but if you want to keep it simple, 2 circuit track run down the line with LED fixtures.