Buying lighting in volume is a different transaction from buying lighting. The unit price is the least complicated part of it. Everything that determines whether the programme survives year two sits in the terms: minimum commitment, sample policy, lead time under different conditions, who owns the tooling, and what happens when a batch under-performs.
Minimum order quantities are best read by product family rather than as a single number, because they reveal how a factory plans production. A representative structure for an automotive lighting manufacturer is one hundred pairs per series for LED headlight bulbs, with different bulb bases permitted inside the same series, and one hundred sets per item for ambient lighting, off-road bars and pods, truck lighting and miniature bulbs. Series-level commitments let a distributor cover a wide application range with one order, which is the sensible way to build an initial assortment.
Custom development is quoted differently, and honestly so. A new product has tooling, a new bill of materials, a validation cycle and a packaging design, so its commitment is agreed per project rather than inherited from a catalogue. Anyone offered a catalogue minimum on an entirely new design should ask what is being skipped, because the usual answer is testing.
Lead time needs two figures, not one. A build with raw materials already in house can move inside roughly ten days. A build that starts from component purchasing takes around a month, and app-controlled product takes longer still, because firmware, radio approval and packaging have to converge before the goods are saleable. First orders generally run longer than repeats for reasons that have nothing to do with your product specifically: line familiarisation, fixture preparation and inspection routine setup.
The sample stage is where most programmes make their expensive mistake, which is approving a sample that came from a different component batch than the one that will ship. Samples from stock answer whether the design works. They do not answer whether the production build is consistent. Specify what has to be recorded at approval: the lumen figure with its test conditions, the wattage, the base, the connector, beam photographs, fitment results on named vehicles, and the packaging as it will actually be produced.
Private-label setup is the part buyers most often assume is simple. Confirm the marking method, whether retail boxes are produced in-house or outsourced, who owns the tooling after payment, and whether the factory can manufacture from your existing product files rather than only from its own designs. A supplier that supports logo marking, custom packaging and product appearance changes as standard is set up for brand programmes; one that treats each as an exception is not.
A wholesale programme is only worth taking on if the engineering behind it is reachable, which is why car light wholesale and custom lighting services are structured the way they are: design review, prototype sampling, tooling, approval and mass production as separate milestones with defined deliverables, and in-house capability across industrial design, optics, circuit layout, structure and application software so those milestones do not depend on outside shops at every step.
Defect handling is the last term and the one that decides whether a distributor stays. The question is not whether failures happen but how they are adjudicated. A defined route that reviews photographs, video, batch information and test results, then commits to either a replacement or a credit against a confirmed defect, is workable at volume and auditable by both sides. An informal goodwill arrangement is not.
Put all of it on one page before the first order: commitment per family, mixed-base rules, sample provenance, tooling ownership, lead time with and without stock, warranty by grade, defect route and remedy. A factory that agrees to a written version of that page is a partner. A factory that prefers to handle each item as it arises is describing how year two will go.