SST-40-W Specialty White LEDs Luminus Devices SST-40-W Specialty White LEDs are high-brightness cool white LEDs with a maximum output in excess of 1800lm. These LEDs feature compact monolithic emitters ideal for directional lighting applications with high uniformity. The SST-40-W LEDs are available in 5000K, 5700K, and 6500K with 70CRI (typical) colour points. Typical applications include flashlights, automotive accessory spotlights, portable lighting accessories, and instrumentation.