The basic knowledge of the lamp
For example, often said E14 bulb, E27 bulb, GU10 bulb, T8, T9 lamp, etc., but these letters represent what you really know?
For the light bulb, in addition to the different electric light source can be classified, the most fundamental type can be classified by the lamp. Lamps in front, such as "E" "G" "T" and other letters on behalf of its lamp holder, lamp holder of different models.
Lamp holder, lamp holder of the naming method commonly used a complete symbol system to represent.
(A) (b) (c) - (d) / (e) × (f)
Lamp holder symbols: (a) (b) (c) - (d)
The symbol (a) is composed of one or more capital letters indicating the type of the lamp cap.
B refers to bayonet base;
BA refers to bayonet lamp, originally used for automotive lights;
BM refers to the bayonet lamp with miner's lamp;
E means (Edison) screw cap;
F refers to a lamp with a contact;
G refers to two or more protruding contacts, such as pins or posts;
K refers to the lamp with a wire connector;
P refers to the pre-focus type lamp;
R refers to the head with concave contacts;
S refers to the shell type lamp head - in the lamp holder does not rely on the protruding part to fix the lamp head;
SV refers to the shell-type lamp cap with tapered end (V-shaped);
T refers to the lamp with the telephone;
W refers to the lamp end, and the electrical contact of the lamp and the lampholder is done directly through the leads located on the lamp end surface, the glass portion (or other insulating material portion) of the lamp end is essential for the installation of the lamp in the lampholder .
The part (b) of the symbol is made up of numbers which represent approximate values of the main dimensions of the lamp cap in mm. The relationship between the main and the basic symbol letters is as follows.
B, BA, BM, K, S, and SV behind the figures that the shell diameter;
E behind the figure refers to the diameter of the crest of the thread;
The digits following F refer to the diameter of the contacts or other similar dimensions;
The number following G refers to the distance between the centers of two pins; - for two or more pins, the diameter of the circumference of the center of each pin;
The number following P indicates the most important dimension of the component used to position the lamp laterally;
The number following R indicates the maximum transverse dimension of the insulative member of the type which is essential for the mating mounting of the lamp cap in the lampholder; the numeral after T indicates the width between the outer portions of the two contacts;
The number after W indicates the total thickness and width of the sealing glass at the end of the lamp (or other insulating material), with a multiplier (×) between them;
For example: BA15b - that the shell diameter of about 15mm car lamp bayonet base. G13 - that the distance between the two pins is about 13mm dual-pin lamp.
The part (c) of the symbol is formed by a lower case letter indicating the number of contacts, contacts, pins or flexible connectors.
Where: s for a contact; d for two contacts; t for three contacts; q for four contacts; p for five contacts.
For example, E26d refers to an E26 lamp with two bottom contacts and G10q a lamp with 4 contact pins.
The symbol has the part (d), which consists of digits preceded by a hyphen (-), which represents additional components that are important for interchangeability. The part (e) of the symbol consists of a number preceded by a slash (|), which represents the approximate value of the overall length of the lamp cap in mm. This length includes protruding insulating material, but does not include the length of the contacts or pins.
For example: B15 / d19 - refers to the total length of about 19mm B15d lamp.
The part (f) of the symbol is composed of a numeral indicating the approximate value of the outer diameter of the open end or the skirt end of the cap shell.
The number located at (f) is preceded by a multiplication sign (x). The figure indicates that the skirt does not include an approximate outside diameter of the bell mouth or an inside diameter of the open end, in mm.
For example: B22d / 25 × 26 - refers to the total length of about 25mm, skirt diameter of 26mm B22 lamp.
LED lamps commonly used lamp with G5.3, E27, GU10.
G5.3: Two protruding contacts, such as pins or posts, have a center distance of approximately 5.3 mm.
E27: screw cap, the outer diameter of the thread is about 26.1mm.
GU10: Two protruding contacts, pins or posts with basic G type can not be replaced. The center distance of the feet is about 10mm.
In this case,
The letter "T" is mainly used for tube type designation, "T" for "Tube", which means tubular. The next number represents the diameter of the tube, each "T" is 1/8 inch. One inch equals 25.4 mm.
T8 tube diameter is 25.4mm;
And so on, T12 diameter of 38.1 mm;
T10 diameter of 31.8 mm;
T8 diameter of 25.4 mm;
T5 diameter of 16 mm;
The T4 has a diameter of 12.7 mm.