How to control the intensity of an emissive object? [Never Mind]

contedesfees

I've selected a light fixture in a scene, selected the Surfaces palette, opened Iray and applied Emissives. What I'd like to know is how to control the intensity of the emissive. I've found nothing in the Parameters palette and nothing in the Lights palette. Pics below. I'd also appreciate it if someone could enlighten me: what is an .xmp file? Sometimes DAZ Studio renders seem to generate them; sometimes DAZ Studio does not. Thanks to one and all.

Gordig

Emission is a surface property, so it's controlled from the surfaces pane.

contedesfees

I did understand that, Gordig. If you look more closely at the second image I uploaded, you'll see that I was in the Surfaces palette. My mistake was selecting the Presets tab and not the Editor tab.