Hoe LED-modules voor lichtbakken en plafondverlichting te kiezen

Elaine Zhu
Augustus 20, 2026

Het juiste kiezen LED-modules for light boxes and ceiling lighting comes down to five engineering decisions: how many modules to install, what beam angle your cavity depth allows, which color and control system the space needs, and how to size the power supply. The short answer for most projects is this: use a DC24V lensed module on a 68×68 mm PCB, space the modules roughly 80–120 mm apart for an even light-box face (or 150–250 mm apart if the goal is a ceiling star effect), match the 175° wide-angle lens to the cavity depth, and add at least 20% headroom when you select the driver. This guide walks through each decision step by step with real numbers, so you can spec a complete system — modules, controller and power supply — without guesswork and without over-ordering.

led-module-layout-for-light-boxes-ceiling-lighting

Why light boxes and ceilings need dedicated modules

Light boxes and ceilings are unforgiving surfaces. A light-box face that should glow as one even panel will betray every hot spot and dark band if the module grid is wrong; a ceiling that should carry a flowing star or color effect will flicker, flatten or strobe if the control is mis-specified. The margin for error is small, and the result is visible from across the room.

LED modules were designed for exactly this job. Unlike LED-strip, which is continuous and linear, a module is a discrete light engine — typically 4–6 LEDs on a rigid 68×68 mm PCB with its own 175° lens — that you position freely across the surface. That freedom is what makes two very different results possible: a dense, even grid that turns a light-box face into a uniform panel, and a sparse, pixel-addressable grid that turns a ceiling into a star field or a flowing light show. On the SignliteLED range, every module shares the same 68×68×5.5 mm footprint and DC24V input, so you can mix colors and control types in one installation while keeping the layout and wiring identical. Before you place an order, work through the six steps below.

Step 1 — Measure the area and plan the module grid

The first number you need is the total luminous area. For a light box, that is simply the lit face in square meters. For a ceiling, it is the ceiling area that will receive the modules — measure the full panel or suspended-grid section, not just the visible tiles.

How many modules do you need?

Modules per surface = total area ÷ (spacing × spacing).

Spacing is the distance between the centers of adjacent modules, and the right value depends entirely on what the surface is supposed to do. A light box and a ceiling star effect sit at opposite ends of the density scale:

Surface type	Typical spacing	Resulting density	Goal
Shallow light box (50–80 mm deep)	80-100 mm	100–156 modules/m²	Even panel, no hot spots
Deep light box (100 mm+ deep)	100–120 mm	69–100 modules/m²	Even panel, light has room to spread
Ceiling even backlight	100–120 mm	69–100 modules/m²	Uniform glow across the ceiling
Ceiling star effect (point-source)	150–250 mm	16–44 modules/m²	Each module reads as a discrete “star”

Worked example — light box: a 1 m × 2 m light box is 2 m². At 100 mm spacing you need 2 ÷ (0.1 × 0.1) = 200 modules. At 80 mm spacing that rises to 312 modules, which is brighter but also 56% more power draw. The right density depends on the acrylic, the distance to the face, and the required luminance — 200 modules of a 4 W unit (800 W total) already delivers roughly 5,000–6,000 lumens per square meter at 120 lm/W, which is comfortable for most illuminated light boxes.

Worked example — ceiling star effect: the same 2 m² ceiling at 200 mm spacing needs only 2 ÷ (0.2 × 0.2) = 50 modules. A star effect is deliberately sparse — each module is meant to be seen as an individual point of light, not blended into a panel. Go denser than 150 mm and the stars merge into a wash; go sparser than 250 mm and the ceiling looks under-populated. DMX or SPI control is what turns those 50 points into a flowing, twinkling or chasing pattern.

One detail worth flagging before you measure: the two ceiling applications above have opposite goals. A ceiling even backlight uses a dense grid and a wide lens to hide the individual modules; a ceiling star effect uses a sparse grid and lets each module show as a visible point. Tell the supplier which result you want — the module count, the lens and the control recommendation all change with it.

Order 3–5% extra modules as spares; a damaged module mid-install is far cheaper to replace from stock than to re-order and wait for shipping.

Single-color LED-matrixlay-out voor uniforme achtergrondverlichting

LED module spacing layout for light box faces: 80mm for 5mm thick panels, 100mm for 7mm thick panels

Step 2 — Match the beam angle to the cavity depth

This is the decision that separates a professional result from a patchy one. The beam angle of the lens determines how far the light spreads from directly under each module. Too narrow for the depth, and you get bright circles with dark rings between them — called “hot spotting.” Too wide, and the light spills past the intended area and washes out. The same logic applies whether the cavity is a light-box housing or the void above a suspended ceiling.

holtediepte	Recommended beam angle	Waarom
50–80 mm (shallow light box / low ceiling void)	175° wide-angle lens	Light spreads before it reaches the face, filling the gaps between modules
80–120 mm (standard box / standard ceiling void)	160–175°	Wide angle keeps the face uniform without over-spacing
120 mm+ (deep box / high ceiling void)	160° or narrower option	Deeper cavity allows tighter angles; very wide angles lose intensity at distance

The SignliteLED modules ship with a 175° wide-angle lens as standard — that is the sweet spot for the 50–120 mm cavity depths used in the vast majority of light boxes and ceiling installations. If your project calls for a specific spread, such as a narrower lens for a very deep light box or a custom angle for a star-effect ceiling, that is a customization the factory can make during PCB and lens selection, so ask for it when you request a quote rather than assuming the standard lens will behave the same.

Tunable witte LED-modules

LED Type: 2835 SMD
LED Qty: 2 × 4 pcs
Power 4+4W
Efficiency: 100lm/W or 150 lm/W
Color: 2700K–6500K
CRI: Ra90+
Size: 68×68×5.5 mm
Eén kleur BIN, 3 stappen SDCM beschikbaar

Vraag een offerte aan

Pro tip — the 3:1 uniformity rule. The accepted benchmark for an “even” light-box face or ceiling backlight is roughly a 3:1 brightness ratio: the brightest point should be no more than three times the dimmest point. You can verify this in the field with a cheap lux meter before committing to a full layout — walk the surface, note the high and low readings, and adjust spacing or lens angle until the ratio stays under 3:1. Catching a hot-spotting problem at the mock-up stage costs a day; catching it on a finished, installed ceiling or sign costs a re-lamp. (For a star-effect ceiling the 3:1 rule does not apply — you want visible point sources, so uniformity is the wrong metric.)

Step 3 — Pick the color system

Once the grid and lens are fixed, decide what the surface will show. This is a product-family decision, because the color system determines which module you buy:

Color system	What it does	Geschikt voor
Single color (3000K / 4000K / 6500K)	One fixed CCT, static output	Standard light boxes, even ceiling backlight, cost-sensitive projects
Tunable white (2700K–6500K)	Adjust warm-to-cool white	Office and hotel ceilings that change mood through the day
RGBW	RGB color mixing + a dedicated white channel	Ceiling light shows that also need clean white ambient light
RGBCCT	RGB + warm white + cool white in one unit	Full-color ceiling effects plus adjustable white in a single module

Every module in this range runs at Ra90+, which matters more than most buyers expect. A 90+ CRI means the reds in a brand logo, the skin tones in a printed graphic, and the paint colors in a retail space render accurately instead of looking washed out. On a light-box face — where the light source sits directly behind colored graphics — low CRI is immediately visible. If your light box carries brand colors, do not compromise on CRI.

Which white temperature? 6500K cool white is the default for most commercial light boxes — it reads crisp and bright and matches the blue-white look of modern retail lighting. 4000K neutral white is the safer choice for ceilings that also light the space below, such as open offices or lobbies, because it sits close to daylight without the clinical blue cast. 3000K warm white belongs in hospitality, boutiques and premium ceiling environments that want a warm, high-end feel. If you cannot decide on site, the tunable-white module removes the risk entirely: install it, and the client can set the temperature from 2700K to 6500K after the ceiling is up.

Get more details

Step 4 — Decide how the lighting will be controlled

Control is where project budgets quietly explode if you guess wrong, so define the behavior before ordering. This is also the decision that splits a ceiling installation into two completely different products: a static ceiling backlight uses one module, a star-effect or flowing-color ceiling uses another. There are three families, and they are not interchangeable:

Control type	How it works	Addressing	Typisch gebruik
Static (no controller)	Always-on, or simple dimmer / PWM	None — whole circuit on one channel	Light boxes, even ceiling backlight, static brand panels
SPI addressable	Each module is a pixel on a data bus	Every module individually addressable	Programmable ceiling patterns, chasing effects, medium-scale star fields
DMX512	Industry-standard protocol, professional controllers	DMX universes, per-fixture or per-channel	Synchronized multi-zone ceilings, architectural projects, large star shows

Static modules are the right call for the majority of light boxes and even ceiling backlights — they are simpler, cheaper and need no programming. Choose SPI when you want the ceiling itself to animate, module by module, on a smaller scale. Choose DMX512 when multiple zones must stay synchronized across a building, or when the client will operate the lighting from a lighting desk or building management system — this is how a hotel lobby ceiling runs a coordinated star-and-wash show across several hundred modules. For deeper protocol background, see our DMX LED systems guide and the SPI addressable LED explainer in the Knowledge Hub, and our companion article on DMX RGB LED modules for façades, signage and ceilings.

K-1000C DMX programmeerbare LED controller — **CTL-RGBIC-DMX-K-1000C Programmeerbare RGB/RGBW DMX SPI LED Controller**

K-8000C LED-controller voor DMX SPI LED Strip — **CTL-RGBIC-DMX-K-8000C | Programmeerbare LED Controller voor DMX SPI LED Strip**

A note on individually controllable modules: if the brief says “each module must be controllable and dimmable separately,” that is an SPI or DMX specification, not a static one. DMX512 handles it cleanly — each module (or group) occupies its own address, so you can dim, color-mix and sequence every unit independently from one controller. This is exactly how a star-effect ceiling is built: each module is a pixel, and a DMX program drives them into twinkling, flowing or chasing patterns. For a DMX-driven job, ask specifically for DMX modules rather than assuming a static unit can be retrofitted with a controller later; the module hardware is different.

Wiring for controlled modules. SPI and DMX modules daisy-chain: each unit passes data in and data out, with the controller at the head of the chain. Keep the data run short and tidy — long, unshielded data cables are where signal problems start — and follow the module’s wiring diagram for the exact in/out order and for the separate DC24V feed. For DMX, keep each universe as a terminated daisy chain; a ceiling spanning several universes just adds another chain off the controller.

Step 5 — Size the power supply

Total wattage = number of modules × wattage per module

Power supply rating = total wattage × 1.2 (20% headroom minimum)

(If you are also sourcing the driver, our DC24V LED power supply range covers the common 60 W–400 W constant-voltage outputs used in this guide’s examples.)

Systeem	Calculation	uitkomst
200 × 4 W single-color light-box modules	200 × 4 W	800 W
With 20% headroom	800 × 1.2	960 W → select a 1000 W driver
50 × 6 W DMX RGBW ceiling star modules	50 × 6 W	300 W → 360 W → one 400 W driver
300 × 4 W modules	300 × 4 W	1200 W → 1440 W → two 720 W+ drivers

Do not size a driver to exactly 100% of the load. Modules draw slightly more when cold and when dimming down from full output in some configurations; a driver running at its limit runs hot and fails early. The 20% rule is the industry baseline — 30% if the installation runs in a hot climate or inside a sealed ceiling void with no airflow.

Two more wiring points. First, keep every power run within the current rating of the cable and the driver’s output channels — spread large layouts across two or more drivers rather than daisy-chaining the entire ceiling or light box onto one pair of wires. Second, follow the manufacturer’s wiring diagram for the specific module: the DC24V input and the data line (for SPI/DMX) are separate circuits, and mixing them up is the most common field error we see.

If the installation will dim, say so when you size the driver. Not every driver dims smoothly with every module, and pairing a constant-voltage driver with the right dimming interface — PWM, 0–10V or DALI — is part of the system spec, not an afterthought. A driver that dims in visible steps is one of the most common complaints on retrofit jobs where the dimmer was bolted on after the modules were already chosen.

Step 6 — Consider the environment

Indoor light boxes & ceilings — standard modules are fine; no extra protection needed behind an acrylic face or above a suspended ceiling.
Outdoor light boxes — if the box can leak or condense, specify waterproof modules and potted or sealed drivers. Condensation inside a sealed outdoor box is a real failure mode, not a theoretical one.
Heat — modules are happiest below 50°C ambient. In tropical installations, or in a ceiling void packed with other services, add ventilation or derate the module count per driver.
Voltage drop — for long runs, keep the feed cable gauge thick enough that the far end still sees close to 24V; modules dim visibly below ~21V.

When in doubt, send the installation location and climate to the supplier as part of the quote — the correct enclosure, IP rating and driver choice depend on it. For a full walkthrough of mounting, wiring and commissioning, see the LED system design & installation section of our Knowledge Hub.

Quick reference: the 9-module family at a glance

All modules share the 68×68×5.5 mm footprint, DC24V input and Ra90+ color rendering, so any combination below fits the same grid and wiring plan:

modulus	LED layout	Stroom	Kleur	Controle
enkele kleur	4× 2835	4 W	3000K / 4000K / 6500K	statisch
Afstembaar Wit	2×4× 2835	4+4 W	2700K–6500K	Static (CCT controller)
RGBW	6×4 (3030+2835)	4+4 W	RGB + wit	Static (RGBW controller)
RGBCCT	6×4 (3030+2835)	4+4 W	RGB + WW + CW	Static (RGBCCT controller)
SPI RGBW	6×6 (3030+2835)	4 W	RGB + wit	SPI, individually addressable
SPI RGBCCT	6×6 (3030+2835)	6 W	RGB + WW + CW	SPI, individually addressable
DMX Tunable White	2×4× 2835	2×4 W	2700K–6500K	DMX512
DMX RGBW	6×4 (3030+2835)	6+4 W	RGB + wit	DMX512
DMX RGBCCT	6×4 (3030+2835)	6+4 W	RGB + WW + CW	DMX512

Browse the full range with specifications on the LED module light product page, and jump straight to the DMX-controlled series if your ceiling project requires synchronized or individually controllable modules.

Three mistakes that cost installers money

Ordering by price per module instead of by lux per square meter. A cheaper module with a tighter lens or lower output often means more modules to reach the same brightness — the “cheap” option is frequently the expensive one after the count is recalculated.
Ignoring the cavity depth when choosing a lens. Buying a 160° lens for a 60 mm shallow light box, or for a low ceiling void, is a leading cause of hot spotting; the fix is not more modules, it is the wider 175° lens.
Sizing the driver without headroom. A driver running at 100% load fails in the warranty window far more often than one sized at 120% — and a dead driver means a dark ceiling or light box while you wait for a replacement.

FAQ

How many LED modules do I need per square meter for a light box?

Between 69 and 156 modules per m² depending on spacing. At 100 mm spacing, 100 modules/m² is the standard starting point; use 80 mm spacing (156 modules/m²) for shallow boxes or brighter faces, and 120 mm spacing (69 modules/m²) for deep boxes where the light has room to spread. For a ceiling star effect the count is far lower — 16 to 44 modules/m² at 150–250 mm spacing — because each module is meant to read as an individual point of light.

What beam angle should I use for a ceiling installation?

For a ceiling cavity or light-box depth of 50–120 mm, a 175° wide-angle lens is the correct choice — it spreads light across the face before it reaches the acrylic or the ceiling surface and prevents hot spots. For a star-effect ceiling the lens choice is less critical (the points are meant to be visible), but a 175° lens still gives a cleaner, rounder star. Custom spreads can be specified for special profiles.

Can LED modules create a starry ceiling effect?

Yes. A starry or flowing ceiling is built from SPI or DMX addressable modules on a sparse grid (150–250 mm spacing), where each module is an individually controllable pixel. DMX512 is the professional choice for large, synchronized star shows across several hundred points; SPI suits smaller or simpler patterns. Static modules cannot produce a star effect — they have no per-module addressing.

Are LED modules better than LED strips?

Modules win for light boxes and ceilings that need uniform light or pixel control: each module is a rigid 68×68 mm unit with its own 175° lens, so spacing is predictable, heat spreads into the mounting surface, and a failed unit is replaced in seconds without discarding a whole run. LED strips are cheaper per meter and suit slim profiles and linear accents, but they show hot spots at the ends, sag over spans and are harder to repair. For even backlighting or addressable effects, modules are the better fit; for edge glow and coves, keep the strip.

What’s the difference between DMX and SPI?

DMX512 and SPI both address individual LED modules, but they work differently. DMX512 uses a differential bus with per-channel addressing, scales to several hundred synchronized pixels across zones, and integrates with lighting desks and building systems — the professional choice for large ceilings and façades. SPI uses a single data line and is cheaper and simpler for smaller, standalone effects, but pixel count and cable distance are more limited. The modules themselves are nearly identical; the controller determines the protocol. See our DMX RGB LED modules guide for the full comparison.

Can LED modules be controlled individually?

Yes, with SPI or DMX512 modules. SPI treats each module as an individually addressable pixel, ideal for animation; DMX512 is the professional standard for synchronized, dimmable, per-address control across multiple zones or a whole ceiling.

What power supply do I need for LED modules?

A DC24V constant-voltage supply rated at total wattage × 1.2 as a minimum. For 200 four-watt light-box modules, that is 800 W load and a 960 W → 1000 W driver; for 50 six-watt ceiling star modules, that is 300 W → 360 W → a 400 W driver. Keep runs within the cable’s current rating and spread large layouts across multiple drivers.

Kunnen LED-modules worden aangepast?

Yes. PCB dimensions, LED type, CCT, CRI, beam angle, waterproof rating, wiring, connectors and private labeling can all be customized for OEM and ODM projects — including lens angles like 175° and special power targets such as a 1.5 W low-wattage version.

Conclusion: Spec the whole system, not just the modules

A light box or ceiling installation is a system: modules, lenses, controller and driver all have to agree. If you send the surface dimensions, cavity depth, required color and control behavior to the SignliteLED team, you get back a complete recommendation — module family, spacing plan and power sizing — matched to your project. That is faster and cheaper than guessing, ordering, and re-ordering.

Send us your light-box or ceiling dimensions and get a module system recommendation →

Contact met ons!

geschreven door: Elaine Zhu, algemeen directeur bij SignliteLED
Technische beoordeling: Jason Chen, R&D-leider bij Signlitetled
E-mailadres: info@signliteled.com

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