I'm a newbie to Vray. And this is the first interior rendering I've done with vray.

And now I'm trying to do a night version of it. But it's just so hard and facing alot of problems!
I've added a few IES lights. But the light just can't come out. What's wrong? Help please!

Under the light editor menu. We're suppose to load a file right? What file should I load? Please guide me.