The most costly problems in lighting orders were discovered only after the containers had been shipped. Pre-shipment inspection is the lowest cost control point in the entire order, and it is only truly effective when inspecting mass production goods rather than samples picked by the factory.

Sampling is usually performed in accordance with the AQL of ISO 2859-1. Common arrangements for consumer and commercial goods are: General Inspection Level II, zero acceptance of fatal defects, 2.5% for serious defects, and 4.0% for minor defects. "Fatal" refers to defects that may cause safety hazards-exposed conductors, electrified housing, failed withstand voltage test-zero acceptance is the meaning of this level.

The inspection content can be divided into several groups. Functionally, the drawn samples should be electrified and aged, rather than switching them to take a look at them; the real fatal failures-flashing, drive power loss, color cast-occur on the order of minutes, not seconds. In terms of light parameters, it is worth directly measuring the consistency of the color temperature of the sample: the average reading of a batch of goods is 4000 K, but the difference between individual lamps is 500 K, and it will be wasted when installed on the facade. Structurally, check the enclosure, seal ring fit, cable joint torque, lens bonding and labeling. Finally, check the packaging: the strength of the carton, whether the driving end is protected against falling, whether the shipping marks are correct, and whether the quantity per carton is consistent with the packing list.

When the order amount is high enough, ask a third-party inspection agency to intervene and ask them to take samples from the completed production inventory instead of accepting the batch of goods specially prepared by the factory for inspection-the difference between the two is the full value of this thing.