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Two modern electric lamps with lampshades. A lampshade is a fixture that envelops the light bulb on a lamp to redirect the light it emits. The shade is often affixed onto a light fixture to reduce the intensity of the light to observers, shield the light from a harsh environment, or for decoration by altering the color or creating shadows.
In countries with a mains supply voltage of 100–120 volts (e.g., Canada, Taiwan, US), A19/A60 light bulbs usually come with an E26 type Edison screw base (i.e. 26 millimeters in diameter). In the UK , Ireland and many Commonwealth countries, they usually come with a B22 type bayonet cap base.
High-lumen retrofit lamps for 40W T12 lamps in North America. Popular tube diameter in Japan; Circular 32W and 40W T10 lamps (Older versions of the 32W and 40W T9 lamps) T12 T38 1 + 1 ⁄ 2: 38.1 G13 bi-pin; Fa8 single-pin; R17d recessed double contact; One of the first diameters of fluorescent lamps, with the 15W T12 and 20W T12 having been ...
(The exception was the largest lamp with 85 cm top shade, which used the 4:2:1 proportions). The first line of lamps were made available in five sizes. The lamps sizes in the system were given rational name scheme: 8/8, 6/6, 5/5, 4/4, and 3/3. The first number in the fraction represents the approximate diameter of the top shade in decimeters.
Mogul lamps are also the subject of a mathematics problem concerning the number of possible combinations of power that can be obtained. As it turns out, the name "Six Way Lamp" is somewhat deceiving since there are in fact 16 possible combinations (without the night-light), including combinations with all lamps of either switch off.
MR lamps are designated by symbols such as MR16 where the diameter is represented by numerals indicating units of eighths of an inch. Common sizes for general lighting are MR11 ( 11 ⁄ 8 inches, 35 mm) and MR16 ( 16 ⁄ 8 inches, 51 mm), with MR8 ( 8 ⁄ 8 inch, 25 mm) and MR20 ( 20 ⁄ 8 inches, 64 mm) used in specialty applications.