1. Check the size and packaging of the light bulb for the manufacturer's name, address, phone number, implementation standards, trademark number, packaging design, and whether the printing is exquisite and beautiful. Understand whether the product number is matched with a well-known automobile factory.
2. Appearance: Visual inspection shows that the assembly of the filament, lamp head, and bubble shell should be correct and symmetrical; The solder joints are smooth and firm, the lamp head is bright, and there are no scratches; The transparency of the bubble shell is good, with no obvious gas lines or bubbles; The filament is regular, neat, and not deformed; The wick is neat and not more than 5 degrees crooked; The adhesive connecting the bubble shell and the lamp head is not exposed and the adhesion is uniform; The steel stamp on the lamp head is clearly typed, with a brand and specification, and some products also have a batch number with a certification number.
3. Mechanical strength: Use your left and right hands (wearing gloves) to twist the lamp head and bubble shell separately (with no more than 15N of force), and check if the adhesion between the lamp head and bubble shell is firm; Gently touch the bubble shell on a wooden table and gradually apply force to determine the thickness and strength of the bubble shell; Use your fingernails to press the surface and feet of the lamp head to check for deformation and determine its strength.
4. Optoelectronic parameters: If conditions permit, instruments and meters can be used to detect whether the current, luminous flux, and lifespan of the light bulb meet the parameter indicators specified in relevant standards, and determine whether it is qualified or not.
When general consumers purchase light bulbs, they can purchase qualified products by mastering the characteristics of the first three light bulbs.
The characteristics of inferior light bulbs
1. The packaging design is rough, the imprint is unclear, there is no factory name, no address, no phone number, and no execution standards.
2. The appearance is dirty, the filament is black and twisted, the inner wire is oxidized and black or dark red, the lamp head is rusty and lacks luster, with obvious crooked head, crooked shoulder, and crooked core. The lamp head has no steel stamp or only the specification without a brand.
3. Low mechanical strength, thin and fragile bubble shell, thin lamp head, collapse of lamp head feet and skin when pressed with nails, and exposed or uneven adhesion between lamp head and bubble shell.
4. Most of the various optoelectronic parameters are unqualified.
Don't be careless when identifying light bulbs
1. New varieties that have not been heard of should be thoroughly understood and not easily purchased, such as "vacuum halogen tungsten bulbs", which are pure counterfeit goods.
2. When purchasing, understand the purpose of the light bulb and identify whether it is a car light bulb and which part of the car it is used for. Never be careless.