WL-SFTW SMD Full Colour LEDs. The WL-SFTW series from Wurth Elektronik are full-colour LEDs in a surface mounted (SMD) package. They have a 3528 industry standard footprint and a waterclear lens. A black face gives the WL-SFTW a high on-off contrast, ideal for use in displays. These RGB LEDs offer individual RGB control and fast switching. Suitable applications for the WL-SFTW RGB LEDs include; keypad lighting, torches, switch indicators, decorative lighting, electronic signage, video displays, LCD/TV back lighting and household appliances. The WL-SFTW are also ideal for use with light pipes.. Features of the WL-SFTW RGB LEDs: Industry standard 3528 footprint RGB (red, green, blue) LED Low energy consumption High reliability RGB individual control Black face