Hi Carlos,
Those settings are for source of the light within the item. For example if you set a recessed spot up against a wall and change the vertical angle to 45 the light from inside the spot will come out shining to the right. If you change it to 320 it will come out shining to the left. If you set the angle to 180 there will be no light coming from the recessed spot because the light will be pointed back up into the light itself. Think of a circle around the item in either the horizontal or vertical plane and the light source will point in the direct of the angle you choose in the appropriate variable.
Hope that helps.
Neil
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