A Buyer’s Guide to Samples, Drawings and Approval Before Production

Custom lighting orders depend on approved information. A reference photo may explain the overall style, but it does not define the exact size, finish, wiring, suspension or installation method. Shop drawings and samples turn that early idea into instructions the factory can follow.

The approval stage should be treated as part of the project programme. Rushing it can save a few days at the beginning and create much longer delays if a detail has to be changed after materials are ordered.

What to check in a shop drawing

Start with overall dimensions and compare them with the latest architectural drawings. Check the canopy size, suspension length and lowest point. Review important internal dimensions as well, particularly where glass pieces, shades or branches have to fit around a metal structure.

The drawing should show fixing points and estimated weight for large fixtures. Electrical information should include voltage, wattage, colour temperature, driver position and dimming method where applicable. If the light is made in modules, ask how those modules connect and whether the joints will be visible from normal viewing positions.

Use finish samples as control references

A finish description such as brushed brass or smoke grey glass leaves room for interpretation. Approve a physical sample when colour or texture matters to the interior. Mark the sample with the project name, item number and approval date, then keep matching references with the buyer and factory.

For handmade materials, a range sample is more useful than one isolated piece. It shows the acceptable variation in colour, bubbles, texture or edge shape. If the project requires a very tight match, discuss that requirement before the quotation because it may affect selection time, waste and cost.

Decide when a mock-up is worthwhile

A complete prototype is not necessary for every project. A partial mock-up may be enough to confirm a connection detail, glass arrangement or light effect. For repeated fixtures, public areas or a new construction method, a full sample can prevent the same issue from being repeated across the order.

Agree what the sample is meant to test. Appearance, dimensions, light output and installation may require different types of mock-up. Record the result with clear comments and photos so the production team knows which details are accepted and which need revision.

Close the approval record

Scattered comments in email and chat are easy to miss. Keep a final approval sheet or marked drawing that brings the decisions together. It should state the approved drawing revision, material references, electrical specification, packing requirements and any agreed deviations from the original brief.

Production should start from that final record. If a later change is requested, note the effect on cost and schedule before authorising it. A simple revision log helps the buyer, designer and factory work from the same information.

Well managed approvals do not remove every production question, but they reduce avoidable interpretation. They also give the inspection team a clear standard when the finished fixture is checked before shipment.