please sugest a rail mounted light.

You can choose the [url=http://www.opticsplanet.com/leapers-multi-functional-pistol-flashlight-package-lt-tlp08.html]Leapers #ELP08 LED light[/url] with the optional remote #PSTL08A. We don't have the remote listed on our site yet, though.

Remember, you get what you pay for. Buy a [url=http://www.opticsplanet.com/streamlight-tlr1-weapon-mounted-flashlight.html]Streamlight TLR1[/url] with a [url=http://www.opticsplanet.com/streamlight-tlr-battery-door-switch-assembly.html]door[/url] and a [url=http://www.opticsplanet.com/streamlight-plug-in-remote-switches-for-tlr-weapons-flashlights.html]remote[/url].

...forgot to add, I would rather use LED than Xenon.
Are there filter options to help preserve [url=http://www.opticsplanet.com/nightvision.html]night vision[/url]?

It will be attached to a home defense weapon. It needs to have a remote pressure switch, be compact and unobtrusive and cost less than $100.