Appearance
Inspect the allowable range of lens surface defects and internal defects under the light.
Power
Inspect the allowable range of lens surface defects and internal defects under the light.
Lens Thickness
Using a micrometer to check the lens thickness.
EMI
The front side of the lens with the hard multi-coating should be placed on the top black sensor button. If the lens has an EMI coating, the light will focus, or you may hear a beeping sound.
Lens Diameter
Using calipers to check the lens diameter.
Waterproof performance
Use a water pen to mark the lens and check if any marks remain.
Coating Color
Use color testing equipment to compare the tested sample data with the standard data to determine if it meets the qualifications.
Salt Water(The Corrosion & Heat Resistance Test)
Hang the sample in the test container and fully immerse it in a 5% sodium chloride (NaCl) aqueous solution. Boil the solution (approximately 100°C) for 20 minutes, then transfer the sample to cold water at room temperature. Afterward, remove the sample, wash it, and gently wipe it dry with a soft, clean cloth. Examine the largest reflective surface for any signs of cracking or peeling.
Adhesion (The Cross Hatch Test)
A cross-hatch pattern is created on the lens surface by cutting parallel lines through the coating with a sharp blade. Then, a piece of 3M tape is pressed onto the lines, and quickly removed. The edges of the cuts should remain smooth, with no squares of the cross-hatched area detached.
Scratch Resistant(The Steel Wool Abrasion Test)
Place the sample in the anti-friction equipment. Fold 000# steel wool (with a load of at least 750g) and rub it back and forth for 1000 cycles. The difference between the haze value of the sample after friction and the haze value before friction should not exceed 0.8%. This test provides a qualitative rating ranging from poor to excellent.
