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Yes do U shaped. My pantry is currently done that way. Without it the storage capcity would be crap.
Side note. If you want more room in there, consider insetting the pantry into the stud cavities.
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U shaped avoids the dark and deep shelves that you cannot see under well.
There are a number of brands of batter operated light to put under shelves.
They often have a 'motion sensor' of sorts to turn them on and off.
How well they work is hit or miss.
Many do not have sensors adequate enough to sense IR from a warm hand passing near them.
If you purchase them make sure you can return them if they do not operate in your application.
They are often more useful in closed cabinets that are very dark until the door is opened to shine some light and trip them on.
It is stil far more reliable to just put in a wired switch that operates
at a lower AC voltage (like 24 VAC) since 'central heat' transformers are inexpensive.
The voltage is high enough to allow reliable switch contacts, and the wires are small
enough to be easily attached to the bottom of the shelves and run through walls with
little protection required.
The NEC has rules for low voltage power limited control circuits that are rather relaxed.
It can still be a bit of a PITA to run the control wires, 120 V power lines, and hide relays
under the shelves though.
I try to get as much of the wiring in place before installing the shelve.
At 24 V power limited those wires do not require boxes of any type to make junctions.
The 120 V supply lines DO REQUIRE enclosures.
If you step up to 48 V you can power incandescent lights with thin wires and still do
not have to enclose them or protect them all that much.
Voltage below 24 start requiring larger wires for incandescent.
LEDs are better but can be hard to find in commercial packages at reasonable prices.
I have cannibalized LED light by removing there 120 V power supplies and running them at lower voltages.
With the advent of lower voltage lighting yo may be able to find LED lights designed to operate on
lower voltage DC but not the super low 12 V range.
The COB type LEDs and fixtures using them operate on slightly higher DC to keep the
current down and reduce the wire size to feed the power to them.
'Bare' LEDs often need series resistors or a switching power supply to drive the actual LED.
Using the resistor to ballast them ends up wasting a lot of power (but still well below an incandescent light).
If it is powered by 120 VAC at some point actual power may not be as much of an issue.
I have some small COB power supplies that switch 120 VAC inputs to drive lower voltage LEDs without being
oversize and requiring large low voltage conductors.
You just use more of them.
Maybe one for every 2 to 4 shelves.
It is not all that hard to hide the small NEC required boxes on the bottom of upper
shelves at the back of a few shelves.
Good planning can limit how much work you need to do after the shelves are installed.
I have placed very small plastic boxes near the underside front of the shelves to reduce
the work required after they are installed.
If you use thinner plywood for the shelve and add a wooden edge to stiffen them it provide
a nice place to hide boxes at the front of the shelf to make the 120 V connections.
It is mostly a game of finding lower (but not as low as 12 V) light sources.
Look at the electronics stores (like Digi-Key) for boxes, wires, relays, etc.
They have a few light available also.
Mouser is another vendor.
30 V seems to be a popular voltage for round low profile packaged COB lights.
30 V pacaked COB lights