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These blue and green dual colour LED'S have 3 pins - Cathode is the longest pin and the other 2 pins for each colour. This LED can be used as two status indicators. Of course, you can also adjust the lightness of each colour, with PWM. The lens of this dual colour LED is 5mm in diameter.
Wavelength : Blue 460~465nm; Green 520~525nm
Brightness : 600~1000MCD
Forward Voltage : 3.2V~3.2V (Blue) and 3.0V~3.2V (Green)
Current : 20mA.