Originally posted by Cav-man
Here's a great source for LEDs, it's an Ebay store named Chi Wing LED product shop. here's the address to it: http://stores.ebay.com/Chi-Wing-LED-...enameZl2QQtZkm
I assume you will want to use Red LEDs, which operate on 1.7V, not the 3V - 3.5V that many other colored LEDs operate on.
not all red leds operate on 1.7 volts. in fact, this is the exception, rather than the norm.
always check the specifications of the leds you are using prior to wiring and selecting a resistor.
digikey.com is a good source for low cost leds. they carry a huge selection of them, in different sizes, colors, lens shapes, output brightness, and of course, forward voltage.
for a tail/brakelight application, use the 2 way leds, and make sure that the brightness is a minimum of 2000 mcd (milli candella)
this will help ensure you are not rear ended during the day by some *** who can't see your lights.
I would even recommend 4000+ mcd, as they don't draw much more power (less than an extra 10Ma) and the cost is usually the same.
buy in bulk, and the price drops even more.
arrange a group buy, and you could peobably get the price down to about 12-15 cents each, without buying 1000 at a time and waiting for delivery from HK.
digikey sets up group buys all the time.