This distinction between edge lit vs back lit LED light box matters more than most buyers realise, and getting it wrong is one of the most common LED light box purchasing mistakes made in the UK market.
Edge-lit LED light boxes have LED strips running along the frame perimeter. Light travels from the edge inward through an acrylic diffuser panel and illuminates the graphic from behind. This format produces a slim profile and works well for smaller sizes up to roughly A1 or 600mm x 900mm.
Back-lit LED light boxes have LED arrays mounted across the entire back panel, directly behind the graphic face. Because the light source is distributed across the full panel rather than travelling in from the edges, illumination is significantly more even across larger formats.
The practical rule:
- For panels under 800mm wide: edge-lit is generally fine if the diffuser quality is good
- For panels over 800mm wide: back-lit produces noticeably better illumination evenness
- For premium installations where quality is visible: back-lit is worth specifying regardless of size
Boardsy produces both formats. The ultra slim LED advertising board uses edge-lit technology for wall-mounted retail and corporate environments. For larger formats and exhibition builds, the custom LED standing light box uses back-lit technology.