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Technical SpecSource Material: AlGaInP Emitting Colour: Yellow Emitting Wavelength (nm): 585-595 Size: 1.2 x 0.8 mm Intensity (mcd): 60-100 Viewing Angle (deg): 120 Forward Voltage (V): 1.8-2.4 Forward Current (mA): 20-30
Running them in series would be a daft idea, basic physics tells us that the second led in the circut will be dimmer in series.
So, conclusion please? Sorry, been away for a while