Do you mean for using with night vision? If so, I have never saw one, but I have saw some lens for the mini and full size mag lights, that only let the IR light thru the lens.
They don't exist, at least to my knowledge. Osram makes a high power IR LED (golden dragon) that can be driven up to an amp. Here's one I installed in a Pelican M6:
This will go out 100+ yards easy using Gen III night vision.