Things to keep in check before sourcing LGP Sheets
- Specify PM-MA for optical clarity and low yellowing, or poly carbonate when impact resistance is required; confirm sheet sizes and thicknesses before finalizing the design. Ask vendors for thickness tolerances and recommended LED spacing.
- Request xenon arc or equivalent accelerated UV reports, delta E and yellowness index results and impact test data before approval. Photometry and weathering numbers let you compare materials on the same basis.
- Agree MOQ, lead time breakdown, sample workflow and inspection/refund conditions before bulk purchase. Negotiate a pilot order and clear acceptance criteria to avoid surprises.
- Order a sample kit and a CNC or laser-cut test for photometry and fit to verify LED count and uniformity before committing to volume. A small pilot removes uncertainty about thermal behaviour and reflector choices.
Before bulk orders, validate sample panels using your LEDs and mounting geometry to confirm LED spacing, count and perceived brightness. A small prototype run removes uncertainty around thermal behaviour, reflector choices and frame coping, and helps avoid costly rework during installation. For local sourcing and finished samples see our LGP Sheet for LED product page for ordering details.
When requesting quotes, ask for concrete optical numbers rather than marketing terms. Require total transmission (aim for at least 92% on acrylic), haze percentage, measured luminance or uniformity curves, thickness tolerance (for example ±0.1 mm) and surface flatness specifications. These figures determine legibility and colour saturation; higher transmission and low haze give sharper fonts, while tight tolerances and good flatness reduce hot spots and allow fewer LEDs.
Request accelerated UV weathering reports to judge yellowing and colour stability. Ask for xenon arc exposure data with delta E and yellowness index (YI) at stated hours, for example 1,000 and 2,000 hours. As a practical guideline, accept delta E under 3 after 1,000 hours and under 5 after 2,000 hours for outdoor applications; larger shifts warrant a different resin or coating.
You can use following questions for getting started:
- Provide the exact material grade and the virgin resin source. Ask for a resin specification, certificate of analysis and the batch number so you can confirm PMMA or PS.
- Describe the dot or microstructure method used in the LGP. Request a high-resolution photo and a pattern density report.
- Supply optical specifications including total transmission, haze and measured uniformity. Attach integrating-sphere reports where available.
- Provide UV/weathering results with delta E or yellowness index at stated hour counts. Include xenon arc test reports or equivalent exposure data.
- State thickness tolerances, surface flatness and maximum panel size. Confirm the typical tolerances you will hold in production.
- Confirm flame retardancy and any safety approvals such as UL or local code listings. Attach the exact certificates and clarify whether testing was for the raw sheet or an assembly.
- State minimum order quantities, sample policy and the cost for a finished test panel with the requested finishing. Include lead times for a finished sample.
- Provide lead times for samples, pilot runs and bulk production. Note any rush options and setup time for custom dot patterns or tooling.
- Detail packing and shipping terms including FOB or CIF quotes, insurance and typical freight responsibility. Specify export packing methods and pallet configurations.
- Share reference projects or independent lab validations. Request at least one signage case study and a contact you can call for verification.