When sourcing backlit boards, you must prioritize Light Uniformity and Luminance. Ensure the board utilizes High-Density LED strips or a Laser-Dotted Light Guide Plate (LGP) to prevent 'hot spots' or dark areas. For durability, specify Acrylic (PMMA) over PS materials, as PMMA offers 92% light transmittance and superior UV resistance, preventing yellowing over time. Additionally, verify the Color Temperature (CCT)—typically 6500K (Cool White) for advertising or 3000K-4000K (Warm/Neutral) for interior decor—to ensure it matches the brand's visual identity.