Re: Lamp wip
Ah. You need to select your vertices in either clockwise or counter-clockwise order when you are choosing them to make an ordered surface. Which order you select them in will determine which way the surface normal faces. If you don't select them in a circular fashion, you'll get a face like the one in your screen shot.
As far as fixing the t-junction, select the two vertices along the edge of the lower face, then click Vertex > Insert Vertex. Then snap the new vertex and the one at the end of the t-junction together and optimize vertices. That should fix it.
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