Upgrade Your Trucks with LED Trailer Lights for Energy Efficiency

"Some lighting manufacturers have been successful with their LED systems and are now being tapped to do custom fixtures for a number of truck manufacturers like Volvo. The new lights’ housings are essentially the same as the OEM units, except for the LED light arrangement and the associated circuitry. A stock headlamp may have a single halogen bulb with beam angle support, while an LED headlamp might sport several LEDs of lower voltage but have better luminescence when combined. The LED array for a truck does not necessarily have to be limited to the front. Aside from the trailer lights, you may add new LED marker lights to the trailer. However, you can consider enlisting an auto electrician to reconcile the voltage issues and heat shrink, as well as to properly link the lighting and brakes with the truck."
http://blog.gpartsinc.com/info-articles/upgrade-your-trucks-with-led-trailer-lights-for-energy-efficiency