As a result of creating a new indicator for the F-15C IFF panel, I’ve come across two really good LED resources.
The first is a source of good 180 degree FOV LEDS – http://myworld.ebay.com/cece718
This is an eBay seller that has a HUGE variety of LEDs and related electronics for sale.
The second is a LED resistor calculator. This handy web site calculates the optimal resistor value based on a given input voltage, LED forward voltage (how many volts it needs to light) and LED power consumption in mA – http://www.ledcalculator.net/