Vehicle Lights
Are high intensity discharge (HID) conversion kits legal?
No, in order for a headlight to be legal for use in Washington State, it must conform to the Federal Motor Vehicle Safety Standards (FMVSS) 108 requirements for headlights. The National Highway Traffic Safety Administration (NHTSA) has concluded that it is impossible to produce HID conversion kits (converting a halogen system to HID) that would be compliant with FMVSS 108.
Halogen equipment uses an electrical current to heat a metal wire coil filament to incandescence, while the HID conversion kit's light source incorporates a discharge arc to produce light. HIDs require a ballast for operation. Under FMVSS 108 Section S7.7 (replacement light sources), each replaceable light source for headlamps must be designed to conform to the dimensions and electrical specifications for the headlamp source it is intended to replace. For example, if an HID kit is marketed as replacing an H1 light source, then it must match the H1's wire coil filament size and location, the electrical connector size and location, and the ballast design for use with an H1 light source (which is impossible since there is no ballast).
NHTSA believes this equipment presents a safety risk to the public since the kits can be expected to produce excessive glare to oncoming motorists. In one investigation, NHTSA found that an HID conversion headlamp exceeded the maximum candlepower by over 800 percent.
Are turn signal, taillight or headlamp covers permitted?
No. An aftermarket style ornament or other feature such as tinted plastic glass covers, a grille or allotted covers must not be placed in front of the headlamp lens, or in front of any other lighting devices installed on motor vehicles. (WAC 204-21-230)
Are clear tail lamp lenses permitted?
No. Washington has adopted the Federal Motor Vehicle Safety Standard (FMVSS) 108 for all aftermarket lighting equipment. FMVSS 108 is very specific for tail/brake light lenses as well as front side marker light lenses. Most clear aftermarket lighting lack the required reflex reflectors and side marker lights. Using "red" bulbs in clear lenses is not acceptable as it does not meet FMVSS 108. All aftermarket lighting must have the same functionality as those originally installed.
Are blue or purple dot inserts in taillights permitted?
They are only permitted on vehicles forty or more years old or on any motorcycle regardless of age, the blue or purple insert may not be more than one inch in diameter. (RCW 46.37.100)
Are colored headlight bulbs permitted?
No, all headlamp bulbs must be white in color as defined by Society of Automotive Engineers and FMVSS 108. FMVSS 108 disallows any color coating on headlights and or headlight bulbs.
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