List of automotive light bulb types

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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[edit]

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[edit]

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 Image
H1 1 6 V & 12 V: 55 W
24 V: 70 W
P14.5s USA, Japan H1-Lampe-12V-55W 20050302 1950 2247.jpg
H3 1 6 V & 12 V: 55 W
24 V: 70 W
PK22s USA, Japan Osram H3 12V 55W.jpg
H4 2 6 V & 12 V: 60 / 55 W
24 V: 75 / 70 W
P43t Japan Similar US bulb: HB2 (9003) H4 Philips Premium used.JPG
H7 1 12 V: 55 W
24 V: 70 W
PX26d USA, Japan Philips H7 12V 55W.jpg
H8 1 12 V: 35 W PGJ19-1 USA Philips H8 12V 35W.jpg
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 Osram H15 12V-15-55W lamp.jpg
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 HB4 (9006) bulb 12 V, 51 W
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 Automotive Light Bulb, Model: S2, Voltage: 12 V, Wattage: 35 W / 35 W, Socket: BA20d
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 Image
C5W SV8.5 1 6 V, 12 V, 24 V: 5 W Old designation: C11 C5W lamp.JPG
H6W BAX9s 1 12 V: 6 W H6W Halogen Lampe.jpg
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
P21W.jpg
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
Osram 12V 21W 5W.jpg
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 Philips PH24WY.jpg
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 Philips PSY24WSVplus lamp.jpg
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 P27 7W lamp.JPG
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
PY27 7W lamp used.JPG
R5W BA15s 1 6 V, 12 V, 24 V: 5 W Old designation: R19/5 R5W lamp.JPG
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 R10W lamp.JPG
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 T4W lamp.JPG
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 Philips 12V 5W.jpg
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 W16W lamp broken.JPG
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
W21W lamp.jpg
WY21W WX3×16d 1 12 V: 21 W Amber
US designation: 7440NA
WY21W lamp.jpg
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
W3x16q.jpg
WR21/5W WY3×16q 2 12 V: 21 / 5 W Red
Group 3 (For replacement purposes only)
Category Cap (Base) Filaments Nominal power Comments Image
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 H2 automotive lamp.jpg
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[edit]

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 Image
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 Xenonlamp.jpg
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 / 25 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[edit]

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 Image
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[edit]

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 Image
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
PC194 lamp.JPG

Other countries[edit]

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)
H3c.jpg

See also[edit]

References[edit]