Lights Bulbs for cars are manufactured in standardized formats. All highly regarded automotive bulbs come with the integrity of compliance with international and national regulations.
Codes of automotive bulbs associated with their applications are commonly referred as below:
Headlamp / Low Beam or Full Beam : R2, HB3, HB4, H1, H3, H4, H7, D1S, D2S
Front Indicator : W21W, P21W, PY21W
Side Indicator : W5W, WY5W
Rear Indicator : W16W, W21W, P21W, PY21W, H21W
Parking/ Marker Light : W3W, W5W, T4W, R5W, H6W
Fog Light : HB3, HB4, H1, H3, H7
Reverse : W21/W, P21W, W21/5W, P21/5W
Brake Light/Taillight : P21/4W, W21/5W, P21/5W, W21W, P21W, W5W, T4W, R5W, R10W, C5W, P21/4W, P21W
Rear Fog Light : P21/4W, W21W, P21W, W21/5W, P21/5W
Number Plate Light : W5W, T4W, R5W, R10W, C5W
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