Let there be less light please

So today I've been working on a new level; I want a serene night time setting, so a lot of thought will be going into the lighting.

One thing I thought would be nice is a particle spawning from certain points of the floor.

Oh boy.



So here's an untextured level with a particle effect. Notice how little lights float around just the character. Now notice how there's a million other lights dotted everywhere else.

Here's my issue.

The material is only visible when hanging around my character, but I've no idea how to tell the particle to put lights onto ONLY what's viable. I'm completely lost.

I'll carry on, but I'll probably have to pester a tutor for a solution.