If you want the entire hallway to be lit, you'll need several cans, not just 2 or 3. Cans light up what's under them, and that's all.

You'll be better off to install one or two extra surface mount fixtures which provide some indirect lighting (reflecting from ceiling and walls) to help fill the hallway without shadows.

Don't be caught up in the fad for cans. They are the worst possible choice for general lighting.

They light up a room evenly ...

Only if you use large numbers of them. You can use about one-third as many fixtures if you use surface mounts. You'll have fewer shadows and less energy use, both from the smaller number of fixtures and from the lack of 6" perforations in the ceiling.

Lighting designers figured out over 70 years ago that a combination of direct and indirect light was the most even, eye-friendly way to light a room. Cans provide essentially *no* indirect light.

Cans are great for highlighting room features or adding some light to a dark corner. For general room lighting, they're an abomination.

Most of those bright surface mount ceiling lamps take 2 or 3 bulbs, negating the energy use advantage.

In commercial settings, where designers put efficiency first, you almost never see surface mount lamps. 70 years ago, they jumped on fluorescent
lighting. They adopted T8 tubes decades ago, which only in recent years replaced the less efficient T12 tubes. And, in all the most important locations
where good lighting is paramount, like luxury hotel lobbies and office boardrooms, you'll see lots of recessed cans. Look at these examples:

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These rooms use recessed cans for the same reason fine homes do: they put out even, high-quality light, and don't shine in your eyes when
you look at them. Try to imagine surface-mount fixtures in the above photos. Yes you could get away with fewer of them, but they'd call attention
to themselves and light up the ceiling much more than recessed lights do. I like how the ceiling stays relatively dark with cans - the
focal point is underneath them, what the floodlamps are aimed at, not the lamps themselves.

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6" cans are the most common and usually the cheapest. They also provide the greatest spread of light.

Retro-fit cans are used when you do not want to rip out the ceiling / or do not have easy access to the space above.

The connectors can be edison base (being phased out), GU24 base or some other (typically for CFLs).

CFL cans come with the electronic ballast separate from the bulb. When the ballast fails, access to the upper side of the can is required in order to change out the ballast.

LED lights like the CREE LR6/ CR6 will fit into 6" cans. The LR6 and CR6 lights come with either the edison base or GU24 base + pigtail adapter. If the LED unit fails, just pop it out and replace it from below.

The CREE LR6 does appear to output more usable light than a 15w CFL bulb in a 6" can as the emitters are just below the surface and very little light is confined/ absorbed by the can.

HALO LED modules are not as pleasing as the CREE lights - you get a glaring spot of light unlike the LR6.

"In commercial settings, where designers put efficiency first..."

They put appearance first, and efficiency be dammed most of the time.

The efficiency of a lobby is very secondary to the efficiency of the hundred of rooms in a hotel or large commercial building.

How many cans do you see in the rooms?

Many lobbies do not have any way to even turn off the lights besides a breaker.

Just about every other room will have a wall switch.