How to see an enemy if they breach your area.

[BFG Central]

I used to import loads of night vision gear into the UK.
Regarding Ir lights you have to groups,
The 800Nm waves length and the 900Nm and above
The 800Nm to 890Nm is visible to the naked eye as a faint red glow if you look directly at the light source.
900Nm and above is not visible to the human eye.

You can find Ir LED's in your TV remote if you want to build an Ir alarm system.
High powered Ir lasers can be found inside DVD players.

For people that think Night vision gear is beyond there price bracket id can say with fairly cheap components you can build very usable night vision gear if you know what to buy.

Iv just ordered some parts over the last few days to build NV goggles and a NV rifle scope.

It might take a couple of weeks to get all the parts delivered but when i do i will try and do some step by step instructions.