You can locate wolf spiders in your yard at night by holding a flashlight against the side of your head so the light reflecting from their eyes comes right back to your eyes.
They look like brilliant little blue-white sparks.
I've seen moth eye shine in this way too, I don't know what the color was, but they're very small intense points of light, seen when a moth is at rest on a wall. Now I have to try that with wolf spiders!