The type of base used in the lamp.
The base is the contact part of the lamp, which is fixed in the socket and is responsible for fixation, electrical connection and the possibility of safe removal. Thus, the type of base directly determines compatibility with a particular cartridge. However, in addition to this, there is also such a parameter as the base of the base. It determines primarily the contact configuration used on a particular base. And in our paragraph it is written as the second value.
In lamps for different purposes (see above), the set of bases used is very different. So, for the head light the following options are used:
D1S,
D1R,
D2S,
D2R, D3S , D3R,
D4S,
D4R,
H1,
H2,
H3,
H4,
H7,
H8,
H9,
H10,
H11,
H13,
H15,
H16,
H27W /1,
H27W/2,
HB1,
HB3,
HB4,
HB5,
HIR2,
HS1,
M5,
R2. For markers and other similar lights, in particular,
C5W,
C10W,
C15W,
H21W,
H6W,
P21W,
PY21W,
P21/4W,
P21/5W,
P27/7W,
PR21W,
R5W,
R10W,
T4W,
W5W,
WY5W,
W16W are used ,
W21W,
WY21W,
W21/5W.
If desired, you can find a detailed explanation of each designation in special sources.
