Start with the sign construction
Record the sign type before comparing module specifications. A shallow channel letter behaves differently from a deep cabinet or fabric-face light box. Useful starting information includes the internal depth, minimum and maximum stroke width, return colour, face material, face colour and whether the inside of the letter or cabinet is reflective.
Depth matters because it determines the distance available for the module lens to spread light before it reaches the face. A shallow return may need a wider beam pattern or closer spacing. A deeper return provides more mixing distance but can still show shadows if modules are spaced poorly.
Match the system voltage
Use modules and a constant-voltage power supply with the same rated output—commonly 12V or 24V. Do not mix voltage classes. A 24V system can help manage current on longer runs, while an existing replacement project may require matching the installed 12V design.
Voltage is only one part of compatibility. Confirm the module wattage, maximum modules per run, cable length and the power-supply capacity recommended for the product.
Choose optics and spacing together
Lens angle, module output and installation depth work as a system. A wider optical pattern can improve coverage in shallow applications, but the final spacing should be tested against the actual face material and sign geometry. Tight corners, narrow strokes and joins often require different placement from broad open areas.
A small illuminated sample reveals hotspots, dark edges, colour shift and module visibility before an entire production run is assembled.
Specify colour and appearance
For white light, include the required colour temperature rather than asking only for “white”. Warm, neutral and cool white can change the appearance of printed graphics and coloured acrylic. For coloured modules, confirm that the module colour works with the face material and brand standard.
Also consider daytime appearance. Modules, wiring and fixing methods should not become visible through translucent faces when the sign is switched off.
Account for heat, moisture and access
Indoor and weather-exposed signs need different levels of protection. State whether the enclosure is sealed, ventilated, exposed to rain, near heat sources or difficult to service. An IP rating does not remove the need for sound enclosure design, drainage, cable entry protection and appropriate installation.
Electrical installation and final suitability should be checked by a competent installer against the module and power-supply documentation.
Information to send with an enquiry
- Sign type, dimensions and internal depth
- Minimum and maximum letter stroke width
- Face and return materials and colours
- 12V or 24V requirement, if already determined
- Indoor, sheltered or weather-exposed installation
- Required light colour or colour temperature
- Estimated quantity or number of signs
- Photograph, drawing or representative letter shape
LED module FAQs
Can module spacing be chosen from wattage alone?
No. Output, optics, sign depth, face diffusion and geometry all affect spacing. A representative test is the safest way to confirm appearance.
Should I choose 12V or 24V modules?
Match the voltage to the overall design and power supply. Existing installations often dictate the choice; new projects should consider run length, current, product availability and installer preference.
Can one module type cover every letter size?
Not always. Very narrow strokes, shallow returns or unusually large cabinets may need a different format or layout. Share the smallest and largest shapes in the project.