LED Square Downlight – 1 to 4 Heads | DET Series

Square Downlights That Stand Up to Harsh Conditions — Without Compromising Sleek Design

If you’ve ever stood in a retail store or museum and noticed how the lighting seems to follow you — highlighting one product, then another, then a piece of art on the far wall — you’ve probably seen a multihead downlight at work.

That’s exactly what the DET Series from Zerund Lighting is designed to do. But instead of installing three or four separate fixtures, you install one square grille frame with up to four independently adjustable COB heads.

In this guide, I’ll walk you through everything you need to know about square downlights, why the multi-head grille format matters for commercial projects, and how the DET Series fits into your next specification.

Browse the complete Zerund explore our full downlight range — recessed, surface, waterproof and smart options for every project.

What Is a Square Downlight?

A square downlight is a recessed lighting fixture with a square aperture or frame, as opposed to the more common round form factor. The square shape gives architects and interior designers a geometric, modern aesthetic that aligns with contemporary ceiling grids, modular furniture, and minimalist design language.

For buyers, the question isn’t just “round or square?” — it’s “how many light points do I need per fixture?” That’s where the DET Series changes the game.

Most square LED downlights on the market are single-head: one COB or SMD source in one square frame. The DET Series goes further — it’s a serialized grille downlight with 1 to 4 heads in a single square frame, each head independently adjustable up to 50° tilt and 350° rotation.

If you’re specifying LED downlights for a commercial project with multiple lighting zones, the multihead grille format eliminates redundant cut-outs while giving you full directional control.

Why Multi-Head? The Supplier Case

Here’s the practical argument we make to our clients:

Single-head approach: Need 4 light points in a retail bay? Cut 4 holes, wire 4 square recessed downlights, aim 4 heads. That’s 4 cut-outs, 4 wiring connections, 4 trim rings visible on the ceiling.

Multi-head approach (DET Series): Need 4 light points? Cut 1 rectangular hole, wire 1 fixture, aim 4 heads. One cut-out, one wiring connection, one unified grille frame.

The advantages add up quickly on commercial projects with hundreds of fixtures:

▪ Fewer cut-outs — faster installation, less ceiling damage, cleaner aesthetics

▪ Unified appearance — one grille frame instead of multiple scattered trim rings

▪ Flexible beam direction — each head aims independently, so one fixture can light a product display, a signage panel, and a walkway simultaneously

▪ Lower labour cost — electricians install one fixture instead of four

Parameters

Here’s the full DET Series specification matrix across all four configurations:

Single Head

Twin Head

Triple Head

Four Head

Optical Performance: Choosing Beam Angles

The DET Series offers up to four beam angle options depending on the model:

15° Narrow Beam — Pinpoint accent for museum pieces, luxury retail displays, and architectural features. The tightest beam creates maximum drama and contrast.

24° Medium-Narrow Beam — Focused accent for product highlighting, artwork, and signage. This is our most popular choice for retail applications.

38° Medium Beam — Balanced spread for general commercial illumination. Suitable for offices, lobbies,and hospitality spaces where you need coverage without sacrificing directionality.

The beauty of the multi-head design: you can specify different beam angles for different heads in the same fixture. Head 1 at 15° for a product display, Head 2 at 60° for ambient corridor fill — all from one grille frame.