This is usually used in relation to strip lighting length. 3528 means the SMD chips that line the strip measure 3.5mm x 2.8mm, while 5050 means the chip size is 5mm x 5mm
This is usually used in relation to strip lighting length. 3528 means the SMD chips that line the strip measure 3.5mm x 2.8mm, while 5050 means the chip size is 5mm x 5mm