Anyone know how to find bright LEDs?

[LHACK4142]

I wish to get my program, which takes images from a camera then picks out objects based on their color, to be able to pick out the nearest of several identical yellow, plastic poles. One idea I have is to shine a colored light in front of the camera. The light will be about 3-4 inches away from the nearest pole, and the second-nearest pole will be about 2.5 feet away. This light will hopefully cause the pole to different than other of those yellow poles. 

My first question is, what color of light do you suggest I choose in order to get the illuminated pole to stick out against the other poles? There may be red and/or blue objects in the distance, but I can crop those out. The second question is, where can I find LEDs of the appropriate color and brightness that don't need any more than 5 volts.

Thanks!

[Nuke]

digikey, mouser, ebay. pretty much everywhere. there are units available that are so bright they require active water cooling. wavelengths available are wide, though some are less bright if you need specific wavelengths, the big ones are intended for lighting and projection applications and are usually white (though ultra bright red, green and blue are probibly available for dlp projectors). my personal favorites are uv leds. 

Edited January 29, 2023 by Nuke