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Medium - small size traditional or antique style lamps that are 20" - 27" tall to the top of the shade will likely require shades about 9" - 11" side length and 16" - 19" bottom diameter.

Medium size traditional or antique style lamps that are 27" - 30" tall to the top of the shade will likely require shades about 11" - 13" dcb4a51kk side length and 16" - 19" bottom diameter.

Large size traditional or antique style lamps that are 30" - 36" tall to the top of the shade will likely require shades about 12" - 15" side length and 18" - 20" bottom diameter.

For each of the above examples, contemporary lamp shades will generally have larger bottom diameters and possibly side length as well. Larger diameter lamps require larger diameter shades and more slender lamps require smaller diameter shades.

Multiple socket lamps are a special consideration that should be addressed by an experienced lighting professional that you will find in most reputable lamp Health Supplement and lighting showrooms.

SHADE VERTICAL LOCATION: This characteristic of your lamp shade is fairly simple to judge. It is the vertical location of the bottom edge of your lamp shade. On a single socket lamp this will almost always be about 2" below the bottom of the socket assembly. To determine the correct vertical location, first look straight across the bottom edge of the lamp shade and visually line up the near edge of the shade with the far edge of the shade. This line should then intersect about 2" below the bottom of the socket assembly for most single socket lamps. The way that you adjust this vertical location of the lamp shade is with the HARP. This is the "U" shaped wire that attaches the lamp to the shade and it comes in different lengths from about 4" on up.

Shorter shades will require shorter harps and longer shades will require longer harps. Multiple socket lamps are a special consideration and I strongly recommend professional guidance for these instances,T8 LED lamp especially for safety concerns as well as aesthetic values.

SUMMARY: Use the above ideas as a general guideline and it should get you started in the right direction. For further assistance I strongly recommend a reputable lamp and lighting showroom as this type store will likely have knowledgeable experienced staff who are well equipped to help you with the many subtle intricacies of lamp shade selection.