Nichia 500B, 510B and 520B Series LEDs The 500B, 510B and 520B LEDs, from Nichia, are a family of single through-hole LEDs. They have a 5mm (T-1 3/4) package with a clear lens. Available in both colour or cool and warm white options, the 5x0B series are suitable for applications such as portable light, signage and decorative lighting.