Nichia 515A, 515B and 515D Series LEDs. The 515A, 515B and 515D series of LEDs, from Nichia, are a family of through hole devices. This range of LEDs are in 5mm round packages with cool white and warm white colour options. They have a clear, diffused lens type. Suitable applications for the 515x LEDs include; portable light equipment, decorative lighting and signage.. Features of the 515A, 515B and 515D LEDs: Through-hole mounted 5mm (T-1 3/4) package Clear diffused round lens