List of automotive light bulb types

Light bulbs for automobiles are made in several standardized series. Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers.

International

The World Forum for Harmonization of Vehicle Regulations (ECE Regulations) develops and maintains international-consensus UN Regulations on light sources acceptable for use in lamps on vehicles and trailers type-approved for use in countries that recognise the UN Regulations. These include Regulation 37,^[1] which contains specifications for filament lamps, and Regulation 99 and its addenda^[2]^[3] which covers light sources for high-intensity discharge headlamps. Some UN-approved bulb types are also permitted by some other regulations, such as those of the United States or of Japan, though Japan has begun supplanting the former Japanese national regulations with the international UN regulations.

Filament lamps

UN Regulation 37 covers motor vehicle filament lamps. These are categorized in three groups: those without general restriction that can be used in any application, those acceptable only for signalling lights (not for road illumination lamps), and those no longer allowable as light sources for new type approvals but still permitted for production as replacement parts.

**Group 1 (Without general restrictions)**
Category	Filaments	Nominal power (major/minor filament where applicable)	Cap (base) per IEC 60061	Other approvals	Remarks
H1	1	6 V & 12 V: 55 W 24 V: 70 W	P14.5s	USA, Japan
H3	1	6 V & 12 V: 55 W 24 V: 70 W	PK22s	USA, Japan
H4	2	6 V & 12 V: 60 / 55 W 24 V: 75 / 70 W	P43t	Japan	Similar US bulb: HB2 (9003)
H7	1	12 V: 55 W 24 V: 70 W	PX26d	USA, Japan
H8	1	12 V: 35 W	PGJ19-1	USA
H8B	1	12 V: 35 W	PGJY19-1	USA
H9	1	12 V: 65 W	PGJ19-5	USA
H9B	1	12 V: 65 W	PGJY19-5	USA
H10	1	12 V: 42 W	PY20d	USA	US trade # 9145
H11	1	12 V: 55 W 24 V: 70 W	PGJ19-2	USA
H11B	1	12 V: 55 W 24 V: 70 W	PGJY19-2	USA
H12	1	12 V: 53 W	PZ20d	USA	US trade # 9055
H13	2	12 V: 60 / 55 W	P26.4t	USA	US trade # 9008
H13A	2	12 V: 60 / 55 W	PJ26.4t	USA
H14	2	12 V: 60 / 55 W	P38t	Japan
H15	2	12 V: 55 / 15 W 24 V: 60 / 20 W	PGJ23t-1	USA, Europe	15 / 20 W filament for DRL function
H16	1	12 V: 19 W	PGJ19-3
H16B	1	12 V: 19 W	PGJY19-3
H21W	1	12 V & 24 V: 21 W	BAY9s
H27W/1	1	12 V: 27W	PG13	USA	US trade # 880
H27W/2	1	12 V: 27 W	PGJ13	USA	US trade # 881
HB3	1	12 V: 60 W	P20d 90°	USA, Japan	US trade # 9005
HB3A	1	12 V: 60 W	P20d 180°	USA	US trade # 9005XS
HB4	1	12 V: 51 W	P22d 90°	USA, Japan	US trade # 9006
HB4A	1	12 V: 51 W	P22d 180°	USA	US trade # 9006XS
HIR1	1	12 V: 60 W	PX20d	USA, Japan	US trade # 9011
HIR2	1	12 V: 55 W	PX22d	USA, Japan	US trade # 9012
HP24W	1	12 V: 24 W			Exclusively produced by Valeo for PSA Group
HPY24W	1	12 V: 24 W			Amber, Exclusively produced by Valeo for Land Rover?,
HS1	2	6 V & 12 V: 35 / 35 W	PX43t		For motorcycles
HS2	1	6 V & 12 V: 15 W	PX13.5s		For motorcycles
HS5	2	12 V: 35 / 30 W	P23t		For motorcycles
HS5A	2	12 V: 45 / 40 W	PX23t		For motorcycles
HS6	2	12 V: 40 / 35 W	PX26.4t		For motorcycles
PX24W	1	12 V: 24 W	PGU20-7
PSX24W	1	12 V: 24 W	PG20-7
PSX26W	1	12 V: 26 W	PG18.5d-3
S2	2	6 V & 12 V: 35 / 35 W	BA20d		For motorcycles
S3	2	6 V & 12 V: 15 W	P26s		For mopeds

**Group 2 (Only for use in signalling lamps, cornering lamps, reversing lamps and rear registration plate lamps)**
Category	Cap (Base)	Filaments	Nominal Power (Major/Minor where applicable)	Comments
C5W	SV8.5	1	6 V, 12 V, 24 V: 5 W	Old designation: C11
H6W	BAX9s	1	12 V: 6 W
HY6W	BAZ9s	1	12 V: 6 W	Amber
H10W/1	BAU9s	1	12 V: 10 W
HY10W	BAUZ9s	1	12 V: 10 W	Amber
H21W	BAY9s	1	12 V & 24 V: 21 W
HY21W	BAW9s	1	12 V & 24 V: 21 W	Amber
P13W	PG18.5d-1	1	12 V: 13 W
PW13W	WP3.3×14.5-7	1	12 V: 13 W
PC16W	PU20d-1	1	12 V: 16 W
PCR16W	PU20d-7	1	12 V: 16 W	Red
PW16W	WP3.3×14.5-8	1	12 V: 16 W
PWR16W	WP3.3×14.5-10	1	12 V: 16 W	Red
PWY16W	WP3.3×14.5-9	1	12 V: 16 W	Amber
PS19W	PG20-1	1	12 V: 19 W
PSY19W	PG20-2	1	12 V: 19 W	Amber
PW19W	WP3.3×14.5-1	1	12 V: 19 W
PWR19W	WP3.3×14.5-5	1	12 V: 19 W	Red
PWY19W	WP3.3×14.5-2	1	12 V: 19 W	Amber
P21W	BA15s	1	6 V, 12 V, 24 V: 21 W	Old designation: P25-1 Also used for DRL function
PR21W	BAW15s	1	12 V & 24 V: 21 W	Red
PY21W	BAU15s	1	12 V & 24 V: 21 W	Amber
P21/4W	BAZ15d	2	12 V & 24 V: 21 / 4 W	Also used for DRL function along with integrated parking lamp beam
PR21/4W	BAU15d	2	12 V & 24 V: 21 / 4 W	Red
P21/5W	BAY15d	2	6 V, 12 V, 24 V: 21 / 5 W	Old designation: P25-2 Also used for DRL function along with integrated parking lamp beam
PR21/5W	BAW15d	2	12 V & 24 V: 21 / 5 W	Red
P24W	PGU20-3	1	12 V: 24 W
PY24W	PGU20-4	1	12 V: 24 W	Amber
PH24WY		1	12 V: 24 W	Amber
PS24W	PG20-3	1	12 V: 24 W
PSX24W	PG20-4?	1	12 V: 24 W	Similar to PS24W, but with white base
PSY24W	PG20-4	1	12 V: 24 W	Amber
PW24W	WP3.3×14.5-3	1	12 V: 24 W
PWR24W	WP3.3×14.5-6	1	12 V: 24 W	Red
PWY24W	WP3.3×14.5-4	1	12 V: 24 W	Amber
P27W	W2.5×16d	1	12 V: 27 W	US trade # 3156
P27/7W	W2.5×16q	2	12 V: 27 / 7 W	US trade # 3157
PR27/7W	WU2.5x16	2	12 V: 27 / 7 W	Red
PY27/7W	WX2.5x16q	2	12 V: 27 / 7 W	Amber US trade # 3757A
R5W	BA15s	1	6 V, 12 V, 24 V: 5 W	Old designation: R19/5
RR5W	BAW15s	1	12 V & 24 V: 5 W	Red
R10W	BA15s	1	6 V, 12 V, 24 V: 10 W	Old designation: R19/10
RR10W	BAW15s	1	12 V & 24 V: 10 W	Red
RY10W	BAU15s	1	6 V, 12 V, 24 V: 10 W	Amber
T1.4W	P11.5d	1	12 V: 1.4W
T4W	BA9s	1	6 V, 12 V, 24 V: 4W	Old designation: T8/4
W2.3W	W2×4.6d	1	12 V: 2.3 W
WY2.3W	W2×4.6d	1	12 V: 2.3 W	Amber
W3W	W2.1×9.5d	1	6 V, 12 V, 24 V: 3 W	Old designation: W10/3
W5W	W2.1×9.5d	1	6 V, 12 V, 24 V: 5 W	Old designation: W10/5 US trade # 168
WR5W	W2.1×9.5d	1	12 V & 24 V: 5 W	Red
WY5W	W2.1×9.5d	1	6 V, 12 V, 24 V: 5 W	Amber
W10W	W2.1×9.5d	1	6 V & 12 V: 10 W
WY10W	W2.1×9.5d	1	6 V & 12 V: 10 W
W15/5W	WZ3×16q	2	12 V: 15 / 5 W	for motorcycles
W16W	W2.1×9.5d	1	12 V: 16 W	US trade # 921
WY16W	W2.1×9.5d	1	12 V: 16 W	Amber, US trade # 921NA
W21W	W3×16d	1	12 V: 21 W	US trade # 7440 Also used for DRL function
WY21W	WX3×16d	1	12 V: 21 W	Amber US designation: 7440NA
WP21W	WY2.5×16d	1	12 V: 21 W
WPY21W	WZ2.5×16d	1	12 V: 21 W	Amber
W21/5W	W3×16q	2	12 V: 21 / 5 W	US designation: 7443 Also used for DRL function along with integrated parking lamp beam
WR21/5W	WY3×16q	2	12 V: 21 / 5 W	Red

**Group 3 (For replacement purposes only)**
Category	Cap (Base)	Filaments	Nominal power	Comments
C21W	SV8.5	1	12 V: 21 W	Old designation: C15, for reversing lamp only
H2	X511	1	12 V / 55 W	Deleted from Reg 37
P19W	PGU20-1	1	12 V: 19 W
PC16W	PU20d-1	1	12 V: 16 W
PCR16W	PU20d-7	1	12 V: 16 W	Red
PCY16W	PU20d-2	1	12 V: 16 W	Amber
PR19W	PGU20-5	1	12 V: 19 W	Red
PY19W	PGU20-2	1	12 V: 19 W	Amber
PSR19W	PG20-5	1	12 V: 19 W	Red
PSR24W	PG20-6	1	12 V: 24 W	Red
PR24W	PGU20-6	1	12 V: 24 W	Red
R2	P45t	2	6 V & 12 V: 45 / 40 W 24 V: 55 / 50 W
S1	BA20d	2	6 V & 12 V: 25 / 25 W	for motorcycles

Gas discharge lamps

UN Regulation 99 covers gas discharge light sources for use in vehicle headlamps. All light sources acceptable under Regulation 99 are also acceptable under US regulations.

Category	Cap (Base)	Nominal power	Remarks
D1R	PK32d-3	85 V / 35 W	Integral ignitor For reflector systems
D1S	PK32d-2	85 V / 35 W	Integral ignitor For projector systems
D2R	P32d-3	85 V / 35 W	For reflector systems
D2S	P32d-2	85 V / 35 W	For projector systems
D3R	PK32d-6	42 V / 35 W	Mercury-free Integral ignitor For reflector systems
D3S	PK32d-5	42 V / 35 W	Mercury-free Integral ignitor For projector systems
D4R	P32d-6	42 V / 35 W	Mercury-free For reflector systems
D4S	P32d-5	42 V / 35 W	Mercury-free For projector systems
D5S	PK32d-[7]	12 V: 25 W	Ballast output voltage
D6S	P32d-1	42 V: 25 W
D7S	PK32d-1	42 V: 25 W
D8S	PK32d-1	42 V: 25 W

Germany

There is a German national regulation for vehicle bulbs, now superseded by international ECE regulations. Bulbs according to the old German regulation are still manufactured. The German regulation is contained in §22a, Subsection 1, No. 18 of the Straßenverkehrs-Zulassungs-Ordnung (StVZO, Road Traffic Approval Regulation). Per the Fahrzeugteileverordnung (FzTV, Vehicle Parts Regulation), such light bulbs must bear an approval mark consisting of a sine wave (squiggle line) and the letter 'K'. The technical requirements themselves are established by standards produced by DIN.

**German vehicle bulbs per DIN**
Category	Nominal power	Filaments	Cap (Base)	Comments
Form K (DIN 72601, Part 4)	6 V, 10 W	1	SV8.5-8	11 × 41 mm
Form K (DIN 72601, Part 4)	12 V, 10 W	1	SV8.5-8	11 × 41 mm
Form K (DIN 72601, Part 6)	6 V, 18 W	1	SV8.5-8	15 × 41 mm
Form K (DIN 72601, Part 6)	12 V, 18 W	1	SV8.5-8	15 × 41 mm
Form K (DIN 72601, Part 6)	24 V, 18 W	1	SV8.5-8	15 × 41 mm
Form R (DIN 72601, Part 6)	6 V, 18 W	1	BA15s
Form R (DIN 72601, Part 6)	12 V, 18 W	1	BA15s
Form R (DIN 72601, Part 6)	24 V, 18 W	1	BA15s
Form S (DIN 72601, Part 7)	6 V, 18 / 5 W	2	BAY15d
Form S (DIN 72601, Part 7)	12 V, 18 / 5 W	2	BAY15d
Form S (DIN 72601, Part 7)	24 V, 18 / 5 W	2	BAY15d

United States and Canada

In the United States, entry 49 CFR 564 in the Code of Federal Regulations requires manufacturers of headlight bulbs, officially known as "replaceable light sources", to furnish the National Highway Traffic Safety Administration (NHTSA) with product specifications at least 60 days prior to first use.^[4] The specifications supplied by the manufacturer, on approval by NHTSA, are entered in Federal docket NHTSA-1998-3397.^[5] From then on, any light source made and certified by any manufacturer as conforming to the specifications is legal for use in headlamps certified as conforming to Federal Motor Vehicle Safety Standard 108. Light sources for vehicle lamps other than headlamps are not Federally regulated.

In Canada, vehicle headlamps may use light sources (bulbs) conforming to either the US or the international ECE regulations.^[6]^:108(5)(a)

**Replaceable Light Sources for Vehicle Headlamps**
Bulb Type	Trade Number	Cap (Base)	Filaments	Nominal power @ 12.8v (High/Low beam where applicable)	Comments
HB1	9004	P29t	2	65 / 45 W
HB2	9003	P43t-38	2	60 / 55 W	European H4 w/stricter geometric tolerances & lower max output limit
HB3	9005	P20d (90°)	1	65 W
HB3A	9005XS	P20d (straight)	1	65 W	HB3 w/180° straight base
HB4	9006	P22d (90°)	1	55 W
HB4A	9006XS	P22d (180° straight)	1	55 W	HB4 w/180° straight base
HB5	9007	PX29t	2	65 / 55 W
H13	9008	P26t	2	65 / 55 W

**Others**
Category	Cap (Base)	Filaments	Nominal power	Comments	Image
PC194	?	1	14 V? / 3.78 W, ?	Used on circuit boards for e.g. dash lights

Other countries

**Others**
Category	Cap (Base)	Filaments	Electrical Characteristics	Comments	Image
H3C	1	6 V / 55 W, 12 V / 55 W, 24 V / 70 W	Japan (USA for unregulated auxiliary lamps only)

References

↑ [http://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/R037r7e.pdf ECE Regulation No. 37: Uniform Provisions Concerning the Approval of Filament Lamps for Use in Approved Lamp Units on Power-Driven Vehicles and of their Trailers, Revision 7
↑ ECE Regulation No. 99: Uniform Provisions Concerning the Approval of Light Sources for Use in Approved Gas-Discharge Lamp Units of Power-Driven Vehicles
↑ ECE Regulation 99 Amendment 3
↑ "49 CFR 564 - Replaceable Light Source Information" (PDF). U.S. Government Printing Office.
↑ NHTSA Docket 1998-3397: Replaceable Light Source Information
↑ Canada Motor Vehicle Safety Standard 108

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