From SuperBright 420nm 1000mcd 15 degree view angle thru hole clear lens

  LED shipment from electron.com   Even with overnight shipping from Prague these are least expensive LEDs with consistent quality control.

  Red LEDs are electron hogs. They will always be the first to glow and even prevent other LEDs from illuminating.     When designing your circuits be sure to isolate the red LEDs from other colors otherwise you’ll have a darkwad in the final design.   read more on LEDs at wikipedia