One thing to note is:

1)  Silicon diodes typically drop 0.6 - 0.7V.
2)  A standard (red, green, or amber T-1 or
    T-1 3/4) LED will drop around 1.8 - 2.1V.
3)  White and blue LEDs are along the lines of
    4 - 5V.

ATM

--- Michael Vinson <mjvinson@HOTMAIL.COM> wrote:
> LEDs work well on, what, about 20mA? If so, and if 5
> of them each
> have a 0.6V forward drop, then the resistor will be
> about 1 k ohm,
> and it will dissipate around 420 mW of heat. So the
> resistor will
> still get hot (though nothing like wiring them in
> parallel: if you
> do it with one resistor, it'll dissipate like 2.4 W
> (yes, 2,400 mW)
> of heat! Ouch.).



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