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(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.
A lamp shade's surfaces have varying proximity to the light bulb or light source itself, depending on the size and shape of the shade. With larger shades this is less of a problem, since the shade provides an ample funnel for the movement of air up through the shade, whereby heat from the bulb leaves the top of the shade through the opening.
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.
The number that follows the "A" designation indicates the nominal major diameter of the bulb, either in one-eighth inch units in North America [1] [2] [3] or in millimeters in the rest of the world. [4] [5] [6] An A60 (A19) LED light bulb with an E27 Edison screw base
Lamp harp with fluorescent bulb. A lamp harp is the component of a lamp to which the lamp shade is attached. It typically comes in two separate parts, a saddle which is fastened under the lamp socket, and the harp itself which consist of a lightweight frame attached to the saddle at its lower end and extending upwards to a point above the bulb.
The T5 diameter is nearly 40% smaller than T8 lamps and almost 60% smaller than T12 lamps. T5 lamps have a G5 base (bi-pin with 5 mm spacing), even for high-output (HO and VHO) tubes. [ 10 ]