2003 Hummer H2 Light Bulbs Types:
| Bulb | Type |
| Low-Beam and High-Beam Headlamps | 9007 |
| Daytime Running Lamps (DRL) | 4157K or 3157KX |
| Front Parking and Turn Lamp | 4157K or 3157KX |
| Rear Taillamp and Stop Lamp | 3157 |
| Rear Turn Lamp | 3157 |
| Back-up Lamp | 4157 or 3157 |
| Center Roof Marker Lamp | 168 |
| Corner Roof Marker Lamp | 168 |
