From: Flix Saiman
depends on the build and location
The sim i just finished building was done entierly in Full bright but I did custom textures and i shaded the entire thing.
that way no matter the time the build looks amazing
nameof the sim is
Sxy2nd go check it out
First of all, I'd like to say that I do believe it to be a well done sim. The texturing is nice, the build itself is, landscaping, and so on. Now, moving beyond that, I'd like to show something. If you wish the pictures removed, please just say so.
First, the sim (And my current avatar of choice) in regular old CTRL+SHIFT+Y daytime.

It looks nice, the lighting all (Generally) matches, and so on. I believe the lighting it's designed for is actually with the sun down a little bit, but was just taking a couple quick shots for my points.
Now, take a look at this picture:

At first glance, it's still nice. It took a second for me, I admit, to realize that it does indeed look very off to me. I had to pay attention to what I was seeing, rather than just stare at my screen.
The lighting no longer matches, in many ways. Take a look at my avatar, in contrast to the build behind him. He's far too dark! Take into account that the grass is also eerily bright all over, and yet the plants and rocks strewn about are dark as they should be, and you start to realize something here is off. Take a look over my right shoulder, and you'll even see a statue, fullbright, with baked shadows. Where is that light coming from? Why is nothing else lit in a fashion that would allow that statue to look like that? There is certainly something wrong with that, says my mind.
The buildings are all lit like the one behind me, which in contrast with the night sky is almost truly confusing. Again, there are no lights, or shadows, that would account for this uncannily lit building, so one has to assume it's glowing of its own accord.
Now, one last image:

Now the problems are more obvious. We have some Linden Land in the shot, in the same sim, which can't be made fullbright, and the contrast is more obvious. The beach is relatively dark, while the boardwalk, ground, and buildings behind remain explicitly bright. The plants are properly darkened, but this just adds to the confusion in my mind, personally. It just doesn't make sense.
And then you realize there are shadows there, under the chairs, and from the boardwalk. Now, generally, these shadows match in direction. That's all well and good, but... where are they coming from? With the beach, and plants, as dark as they are, there shouldn't be enough light to cast such strong shadows. Take into account that not everything has those shadows, and it seems that the only logical explanation is lighting, and yet there are none there, at least not visible.
This is the problem with Full Bright.
I'll quote this snippet again:
From: Flix Saiman
that way no matter the time the build looks amazing
As I said earlier, I think the build is well done. I cannot, however, agree that 'no matter the time' it keeps that same level of quality. For an entire sim to look good, at any time of day, with full bright active, it needs to follow a few requirements, that are really just more of a hassle than it's worth to most people.
*No Linden Land Showing
*No Linden Water Showing (The shine changes depending on lighting, and could be red at sunset when the land is still purely lit)
*No Shiny Attribute (They become relatively dull at night)
*No non-prim avatars (They respond to lighting, unlike all those fullbright prims)
*Baked/faked shadows where appropriate for the emulated time of day
Along with this, you'd either have to contain it inside of a sky-sphere to avoid the Linden Sky showing through and ruining the effect, or have an explanation for the brightness at night (Such as light fixtures, which could also help with the non-prim avatars).
I think most creators would agree, that's quite a hassle. But, if you're creating a completely full-bright build, these are requirements that have to be met if you want it to follow the general rules of RL. You could, alternatively come up with some other explanation, RP style. (It's all covered in glowing dust, perhaps).
If you're fine with things looking out of place, or improperly lit for the time of day, that's fine. Nothing wrong with that, but it's my personal belief that unless you follow the above requirements, you can't say that it looks as good at any time of day.
Therefore, I avoid full-bright, unless I deem it necessary, or if I ever get to the point of doing a fake-lit interior. Though, even for that, if you take into account the future of SL, and the upcoming (Eventually) shadows, then that becomes redundant, or iffy. You'd need to script it to be able to have that fake lighting turned off, if you wanted to ever sell any to the people who can see those shadows. (Then again, if we always took the eventual future into account, nothing would get built.)
Again, I think your build is a good one, Flix, and I was just using it for pointing out issues that I have with Full Bright, and your above statement.