RE: LED rules of thumb

["Dr John Tankard" <john@xxxxxxx>]

> Vr = resistor forward voltage (nominally 2.4 but check the 
> spec sheet) 

2.4 for Vr is a bit high, typically its in the region 1.9-2.2, the blue
ones tend to be higher (I don't know why) but I fully agree look at the
spec sheet, also note that the light output from a led is non linear,
so
unless you really need a bright led there in not much point going much
beyond the spec for If Typ.

John

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