The square piece is the ultimate factory-finished chip factory, in accordance with the brightness, color, voltage, ESD classification part of the regular products, quality assurance, it is called Sorted Chip,
Wafer is long wafer electrode cutting, is not in accordance with the parameters listed above grade, directly sold semi-finished products, in general, manufacturers think is not worth the score after the test selected directly sell, due to chip in blue membranes arranged in a circular wafer, known as  called the COT (of Chips on tape).

The epitaxial film is finished in the substrate after MOCVD after a long light-emitting layer, the epitaxial manufacturers, there are 2 in., 4 in. and 6 in. Specifications.

The raw footage is to scrap the rest of the wafer in accordance with certain standards in the selection of the chip.

The fake side piece wafer conduct a preliminary sorting, but the classification is fairly thick, less than a square piece of factory rules;
In general, the epitaxial wafers good electrode cutting good is the wafer, the wafer classification re-arranged in square pieces selected in accordance with grades, bad or robot leakage pick, we only have become the raw footage of blue membrane in the wafer.

All the products in Top Led Limited including flexible led strips,led tube,led panel lights, led car light, led growing lights,led bulbs,led downlights and rigid led strip  used sorted chip only.