Thinking about it, living in a city with the dark-seeker. And you are alone. Well, it will be pretty boring right? So let's find something fun to do. Let's find the dark-seeker =)
see they are scared of UV rays... so

1) Wear full UV-ray protection gears
2) Wear UV lamps gao-gao over your protection gears
3) Bring a radio player along
4) Bring a few extra UV lamps along. they would be useful

Now...

go to a very dark place where there would be dark-seekers. GO IN. Place UV lamps on the opening of the door so no dark-seekers get out alive.

Then chiong ah.... playing "the roof is on fire" on your radio.
They would not be able to touch you or even get near you because of your UV lamps. Grab one and while its flesh is burning from your UV, guai lan say, "You like it?"

Execution method is based solely on your own discretion. Be creative ok? haha
And be sure to seek them in the day. Everyday at mid-day. Just to be sure so that in the event they jump out of the window, they would still be burned alive by the natural sun.