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I used 3mm 12v LEDs from Maplins with built in resistors for my n gauge loco lights. Adding a 1N4002 diode on the short leg of the LED prevents burnouts. I found a good diagram on Kettlestack's project page at http://mysite.wanadoo-members.co.uk/genpics/
I find the Ohm's law calculations much too complicated for my simple mind and would much rather just be told which LED to buy.
 
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