Hm, it's not the preview winwow...damn, I can't recall that area's name! :p "Object window"? for most items it's where the material is, for lights it's where you get to edit their properties ;)

you can also do weird effects by altering the light's fall off, but that's complicated, basically you can have a light fall off in ways to fit the scene, like a candle you need it strong to light a scene, but not so strong it blows out what's next to it, you can adjust fall off filter so it fall off with a bell curve not a straight line! ;)

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