The following chart "Lighting ID Codes" shows the DOT lighting code required to be visible on the light in accordance with SAE standards.
| A | Reflex reflector |
| A2 | Reflex reflector for use on vehicles 2032mm or more in overall width |
| A3 | Reflex reflector for conspicuity treatments (CT), for use on vehicles 2032 mm or more in overall width |
| A4 | Reflex reflector for CT (vehicles > 2032mm in width) - 50mm wide [truck/trailer] |
| A5 | Reflex reflector for CT (vehicles > 2032mm in width) - 75mm wide [truck/trailer] |
| A6 | Reflex reflector for CT (vehicles > 2032mm in width) - 100mm wide [truck/trailer] |
| A7 | Reflex reflector for CT (vehicles > 2032mm in width) - 25mm wide [truck/trailer] |
| C | Motorcycle auxiliary front lamp |
| D | Motorcycle and moto-driven cycle turn signal lamp |
| DL | Distributed lighting system (headlamp) |
| DRL | Daytime running lamp not optically combined with a headlamp low or high beam |
| E | Side turn signal lamp - vehicles 12m or more in length |
| E2 | Side turn signal lamp - vehicles less than 12m in length |
| E3 | Rear facing side turn signal lamp |
| E4 | Side facing side turn signal lamp |
| E5 | Side direction indicator lamp |
| EVS1 | Siren - interior location |
| EVS2 | Siren -exterior location |
| EVS3 | Siren -under hood location |
| F | Front fog lamp |
| F2 | Fog tail lamps |
| F3 | Harmonized front fog lamp |
| G | Truck cargo lamp |
| H | Sealed beam headlamp |
| HC | Headlamp center |
| HG | Discharge forward lighting (headlamp) |
| HH | Sealed beam headlamp housing |
| HR | Replaceable bulb headlamp |
| HL | Light Emitting Diode (LED) headlamp |
| I | Turn signal lamp spaced greater than 100mm from headlamp |
| I3 | Turn signal lamp spaced from 75mm to less than 100mm from headlamp |
| I4 | Turn signal lamp spaced from 60mm to less than 75mm from headlamp |
| I5 | Turn signal lamp spaced less than 60mm from headlamp |
| I6 | Rear mounted turn signal lamp and front mounted turn signal lamps mounted 100mm or more from the headlamp, for use on vehicles 2032mm or more overall width |
| I7 | Front mounted turn signal lamp mounted less than 100mm from the headlamp, for use on vehicles 2032mm or more in overall width |
| J1690 | Flasher |
| K | Front cornering lamp |
| K2 | Rear cornering lamp |
| L | License plate lamp |
| M | Motorcycle and motor-driven cycle headlamp - motorcycle type |
| N | Motorcycle and motor-driven cycle headlamp - moto-driven cycle type |
| O | Spot lamp |
| P | Parking lamp |
| P2 | Sidemarker lamp for use on vehicles 2032mm or less in overall width |
| P3 | Clearance, sidemarker and identification lamp for use on vehicles 2032mm or more in overall width |
| PC2 | Combination clearance and sidemarker lamp for use on vehicles 2032mm in width ore more in overall width |
| Q | Turn signal operating unit - Class A |
| QB | Turn signal operating unit - Class B |
| QC | Vehicular hazard warning signal operating unit |
| QD1 | Turn signal operating unit for use vehicles 2032mm in width or more in overall width - Type 1 |
| QD2 | Turn signal operating unit for use vehicles 2032mm in width or more in overall width - Type 2 |
| QE1 | Hazard warning operating unit for use on vehicles 2032mm in width or more in overall width - Type 1 |
| QE2 | Hazard warning operating unit for use on vehicles 2032mm in width or more in overall width - Type 2 |
| R | Reversing (back-up) lamp |
| S | Stop lamp |
| S2 | Stop lamp for use on vehicles 2032mm or more in overall width |
| T | Tail lamp ( rear position lamp) |
| T2 | Tail lamp ( rear position lamp) for use on vehicles 2032mm or more in overall width |
| U | Supplemental high-mounted stop and turn signal lamp |
| U2 | High-mounted stop lamp for use on vehicles 2032mm or more in overall width |
| U3 | Center high-mounted stop lamp for passenger cars, light trucks and MPV’s |
| W | Warning lamp for emergency, maintenance and service vehicles |
| W-1 | Directional warning device - Class 1 |
| W-2 | Directional warning device - Class 2 |
| W-3 | Directional warning device - Class 3 |
| W2 | Warning lamp for school buses |
| W3-1 | Optical warning device - Class 1 |
| W3-2 | Optical warning device - Class 2 |
| W3-3 | Optical warning device - Class 3 |
| W4 | Emergency warning device [triangular shape] |
| WS3-1 | Selective coverage warning device - Class 1S |
| WS3-2 | Selective coverage warning device - Class 2S |
| WS3-3 | Selective coverage warning device - Class 3S |
| W6 | School bus stop arm lamp |
| X | Adaptive [forward] lighting system |
| Y | Auxiliary high beam lamp |
| Z | Auxiliary low beam lamp |