Your lampshade should be at least 2x wider than the widest part of the base. Calculate this by measuring the widest part of your lamp base and multiplying it by two.
Note: If your lampshade is tapered, the bottom of the shade follows this criteria.
In addition, the diameter of the shade (or bottom of the shade, if it’s tapered) should not be greater than the height of the lamp body, i.e. from the bottom of the lamp base to the bottom of the electrical socket.
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