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Topic: Dim LEDs (Read 640 times) previous topic - next topic

JJC114

It is on OUTPUT - I have already made that mistake - and I think I have learnt my lesson on simple circuits

Thanks to everybody who gave me help

MarkT

The colour and forward voltage of LEDs are strongly related.  Red are about 1.7V, orange/yellow 1.9V, green 3V, blue/white 3.5 to 4V.  This is due to the particular semiconductor material used - its bandgap voltage determines the energy/colour of photons emitted as well as the forward voltage (which is somewhat below the bandgap voltage at room temperature, but closely approximates it at absolute zero).

White LEDs are really blue/violet LEDs with a yellow fluorescent plastic coating.
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