Choose shelf lighting by what visitors need to see: the product front, its label, its top or the surrounding graphic. Shelf depth, spacing and opaque shelves can block light from above. Compare an under-shelf LED strip with an arm light in a trial using the real products, rather than selecting by booth floor area.
Map each shelf before choosing a fixture
Record each shelf's width and depth, the clear height above the products and permitted mounting points. Check whether the upper shelf blocks light reaching the row below. A downward-facing strip on the underside of an upper shelf lights the compartment below it; it does not illuminate the top of that same opaque shelf. The top row needs its own suitable source.
When an LED strip can help
A compatible strip can put a light source near an otherwise shadowed shelf compartment. Its position matters: test the product fronts and labels, not just the horizontal shelf surface. Check whether individual LEDs or reflections are visible to visitors; use a compatible profile and diffuser if required by the design. Cut only where the selected product's instructions permit, with power disconnected. A rigid light bar is a separate product and must not be treated as cuttable flexible tape.
When an arm light can help
An arm light can direct light from an approved rail or frame toward exposed product surfaces. Upper shelves may still obscure lower rows, and an arm does not imply a narrow beam. The current 25W fixed-CCT arm light publishes 3250lm, a 120° beam and CRI 90+, with a fixed choice of 3000K, 4500K or 6500K. These model-specific figures do not prove coverage of your shelves or that arm lights are always brighter than strips. Compare light on the same display at the intended mounting positions.
Combine only where the trial shows a gap
For a three-level shelf unit, trial the proposed upper light and examine each row separately. If a lower row is obscured, test a compatible local source below the shelf above it, then compare with that source switched off. Keep the addition only if it improves the intended view without objectionable reflections. Using both types does not automatically eliminate shadows or improve sales; no fixed quantity or aiming angle works for every shelf.
Plan the complete power and mounting system
Follow the exact strip or fixture instructions for supply voltage, driver, connectors, permitted run length, mounting surface and heat dissipation. Do not connect low-voltage tape directly to mains. Confirm total load and the lowest applicable component, circuit and venue limits; matching plug shapes alone do not establish compatibility. Use approved cable routes and secure supports without damaging insulation. Check required model and variant documentation with the venue. Do not assume every display light has the same certification.
Test viewing positions and repeat assembly
Use the actual products, glass doors and packaging. Compare available colour settings on the samples rather than assigning a CCT by industry. Check every shelf's ends, middle, front and back from standing and seated positions, including while someone picks up a product. Record mounting positions, settings and any agreed surface-illuminance readings; lumens per fixture and lumens per metre are not a direct test of shelf visibility. Rehearse dismantling and rebuilding with the intended reusable mounts. Recheck after transport, and have the installer confirm the completed electrical and mechanical arrangement.
Choose the simpler arrangement that meets the tested viewing needs. A strip close to a shelf compartment and an arm light above the unit solve different placement problems; neither format guarantees a result without checking the complete display.