8. LED Versus Conventional Lights
Two styles of trailer taillights and side-marker lights are available: conventional, incandescent bulbs and the newer LED "cluster" lights. The advantage of the former is that replacement bulbs are inexpensive and readily available. LED lights have longer life spans, stay cooler and react to brake-light inputs milliseconds faster. Their downside is, because most are sealed units, if a light goes out, you have to replace the entire unit (not just the bulb cluster).