When sourcing LED strips on Alibaba.com, you'll encounter model numbers like 2835, 5050, and 3528 repeatedly. These aren't arbitrary codes—they represent the physical dimensions of the Surface Mount Device (SMD) LED chip in millimeters. Understanding this naming convention is the first step to making informed procurement decisions.
Physical Dimensions and Basic Specifications
| Chip Model | Dimensions (mm) | Chip Structure | Typical Power per LED | Common LED Density |
|---|---|---|---|---|
| 2835 | 2.8 x 3.5 | Single chip | 0.1W - 0.2W | 60-120 LEDs/m |
| 5050 | 5.0 x 5.0 | Triple chip (RGB capable) | 0.2W - 0.24W | 30-60 LEDs/m |
| 3528 | 3.5 x 2.8 | Single chip | 0.08W - 0.1W | 30-60 LEDs/m |
The 2835 chip, despite being physically smaller than 5050, often delivers superior luminous efficiency due to advances in semiconductor technology. The 5050's larger footprint allows it to house three separate LED chips, making it the go-to choice for RGB color-changing applications. The 3528, while older technology, remains popular for budget-conscious projects where extreme brightness isn't critical.

