Buyer guide

How to Approve a Molded LED Diffuser Sample

A buyer's checklist for LED diffuser covers. Fix the LED setup, compare samples under the same conditions and document the approved resin, finish and assembled appearance.

Start with two approval questions

Ask what the buyer should see with the lamp switched off and what the buyer should see when it is on. For the first, record color, surface texture and acceptable visible marks. For the second, describe where LED points, shadows or light leakage will be judged. Keep both decisions in the sample record.

Keep the comparison setup repeatable

Use the same LED board, drive setting, mounting gap and cover orientation for each sample. Write down the viewing angle and distance and control the surrounding light as practical. If the brief needs a photograph, keep camera settings consistent so the photo is easier to compare with later samples.

Compare material data at matched conditions

Optical transmission describes how much light is transmitted under a stated test. Diffusion also affects how distinct the individual sources look. The Covestro LED portfolio provides grade comparisons at a stated thickness and reports more than one optical property. Use the actual grade, finish and part thickness to select candidates, then check the assembled sample.

Release the reference with its configuration

Record the cover revision, material and color references, finish, and the mating LED board and housing. Note which criteria passed and which need another sample. Preserve a reference sample if possible so a later resin, finish or mold change can be assessed against the original decision.

RFQ checklist

One cover and housing revision, paired with the identified LED board
A recorded test setup with LED drive, viewing distance and conditions
Separate acceptance notes for unlit appearance, illuminated appearance and assembly
An approved reference with material, finish and unresolved items recorded

Related applications

Technical references

Lighting plastics

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