S.T.A.L.K.E.R. Messiah

How about adding colored filters for flashlights, head torches and weapon flashlights? Using a red filter on lights is a basic military tactic to reduce visibility at night. there can be improvised filters using duct tape and a piece of plastic and stock ones wich would be better quality. Also some military grade equipement could have built in filters of multiple colours. And then it can also be used for signalling/ recognition.