Choosing the right acrylic colour is an important part of designing illuminated signage. The colour and transparency of an acrylic sheet can affect how much light passes through the material, how evenly it appears illuminated, and how the finished colour looks when the LEDs are switched on.
For lightboxes, channel letters, illuminated logos and retail displays, understanding how acrylic interacts with LED lighting can help you achieve a more consistent result.
Not All Acrylic Colours Illuminate the Same Way
Acrylic sheets can look very different when viewed under normal lighting compared with when they are backlit.
Translucent acrylic allows light to pass through the sheet, making it suitable for illuminated applications. However, different colours can transmit and absorb light differently.
Some colours may appear brighter when illuminated, while darker or more saturated colours can appear deeper and allow less light through. This means the appearance of the finished sign can depend on both the acrylic and the LED system behind it.
Translucent vs. Opaque Acrylic
For illuminated signage, the distinction between translucent and opaque acrylic is particularly important.
Translucent acrylic allows light to pass through the sheet and is commonly used for lightboxes, illuminated lettering, and backlit signs.
Opaque acrylic is designed to block light and is generally better suited to non-illuminated signage, lettering and decorative applications.
Choosing the appropriate level of light transmission helps determine how the LEDs will interact with the face of the sign.
White and Opal Acrylic for Diffused Illumination
White and opal acrylics are commonly used when an even, diffused appearance is required.
The sheet helps spread the light across the visible surface, which can reduce the appearance of concentrated bright spots from individual LEDs.
The final result will also depend on factors such as LED spacing, brightness, mounting depth, and the construction of the lightbox. Selecting the acrylic and LED system together is therefore important when designing an illuminated sign.
Coloured Acrylic Can Change Under Illumination
Acrylic colour can appear different once illuminated. A sheet that looks one way under ambient lighting may appear brighter, lighter or more saturated when light passes through it.
This is particularly relevant when colour matching is important for branded signage.
For projects where the final illuminated colour needs to be precise, testing a sample with the intended LEDs can help confirm the appearance before production.
Acrylic Thickness Also Matters
The thickness of the acrylic can influence the way an illuminated sign looks and performs. Thicker sheets may provide additional rigidity, while different sheet constructions can affect light transmission and diffusion.
The appropriate thickness will depend on the size and design of the sign, how the acrylic will be fabricated, and how it will be mounted.
Consider the LEDs and Acrylic Together
Acrylic is only one part of an illuminated signage system. The final appearance can also be affected by:
- LED colour temperature
- LED brightness
- LED spacing
- Distance between the LEDs and acrylic
- Sign depth
- Acrylic colour and transparency
- Acrylic thickness
- Diffusion requirements
Considering these factors together can help create more consistent illumination across the finished sign.
Choosing Acrylic for Illuminated Signage
Whether you're producing a lightbox, channel letters, an illuminated logo or a custom retail display, the right acrylic can make a significant difference to the finished appearance.
SAS supplies a wide range of acrylic colours and options for signage, displays and illuminated applications, giving signmakers and fabricators flexibility when selecting materials for their projects.
