Unfortunately, humans do not always see well enough. Yet our need to see doesn’t end when the sun goes down! The risk of having an accident at night is about twice as high as during the day despite the fact that there is less traffic on the road. While the lights of modern vehicles are typically more than sufficient to fulfill the legal requirements, they can often be added to, or improved upon in order to see even more details in low light, or no light situations. A car’s headlight consists of bulb(s), reflector, lens, and housing. While many newer cars, vans and light trucks in the United States are equipped with headlights that have replaceable bulbs, most earlier cars feature sealed-beam headlights that combined the filament, reflector and lens into one unit that fits into the car’s headlight housing (the entire unit is removed and a new one is inserted if replacement becomes necessary).