are you trying to make the lights invisible to everything except nv, or are you trying to protect your nv from those lights?
if its the former, this material is an excellent ir pass through filter and blocks visible light. its basically plexiglass and easy to work with, but its ridgid and not a film. this link will let you buy a sample size piece for just a couple dollars shipped. its enough to do several flashlights or one or 2 smartphones.
http://www.acrylite-shop.com/US/us/details.htm?$product=ghojzr93jwz~p
if you are trying trying to do the latter, there is a long thread on ir pass filters that thread onto a pvs14 that block most visible light but allow ir to pass through.
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