Both LEDs listed to be used in my diagram are 12v leds. I specifically put the RS part# in there for the purpose of not having someone with a few regular leds at home to just go get a sw and leads.
The 276-270 is an encased version and the -209 requires mounting.
The 276-270A mentioned in a post here is non-existant..the correct # is as stated/shown in the diagram as 276-270/12v

Also , be aware that leds are polarity sensitive.
So, pay particular attention to the pos. + sign at the LED in the diagram..

http://members.aol.com/ajdalton7/ledtool.jpg