LED lights are never coated or use lenses to change color, because that doesn't really work. The spectrum of LEDs is nothing at all like a true white light, and indeed, there's no such thing as a white LED nor white light from an LED. You just perceive it what way after light has been passed through phospors, or combined as RGB. But it's still a very broken spectrum, so lenses don't work.
If you have a red lens, like in a tail light, then you must use a red LED, not white. For yellow/amber, obviously, match that color. There is actually a difference between them but I bet they interchange with only small losses.
This makes it sound like they are SMD, not standard pinned LED units?
Which one of these?