SUPERNIGHT® 3528SMD Plug in Led Strips AC 110V High Voltage Series LED Strip Lights Indoor Rope Light Kit Christmas Lighting Outdoor Rope Lighting

They are called SMD3528 because the dimension of the chip is 3.5mm * 2.8mm. These LED chips (one LED per chip) are bright but not as bright as the 5050 side by side but when used in higher quantity can be brighter then a comparible strip of 5050s.

These lights are great for TV backlighting, color splashing walls, accent lighting for crown molding and pictures, under tables and cabinets, bars, etc.

3528 LEDs can be most cost effective, but will not be as bright when compared individually to a 5050 chip, but when there are 600 of them on a reel, they can be brighter than a 5050 strip.