Underglow

Underglow refers to decorative lighting mounted on the underside of a vehicle, projecting a glow onto the ground or the lower body of the car. It is typically produced using LED strips, rope lights, or fiber optic neon tubes, and may include controllers to vary color and intensity. The effect is primarily aesthetic, used to customize appearance at car shows or in street scenes.

History and usage: Underglow gained mainstream attention in the 1990s and 2000s within modified car communities, especially in the United States and Japan. LED-based systems later supplanted older neon due to lower power consumption, greater durability, and more color options. Today underglow is widely used on a variety of vehicles, from show cars to personal projects, with colors ranging across the spectrum and effects from static to pulsing or color-changing.

Technology and variations: Most systems rely on automotive-grade LED strips or neon rope that are weatherproof. Common configurations include a controller module, power supply from the vehicle's electrical system, and a switch or remote to select color and effects. Some systems feature addressable LEDs, allowing dynamic patterns. Installation involves mounting brackets or adhesive backing on the undercarriage, routing wires away from moving parts, and ensuring proper sealing to resist water and road debris. Heat concerns are modest with LEDs but still considered in design.

Legality and safety: Laws governing underglow vary by country, state, and city. Some jurisdictions prohibit underglow while driving or restrict colors to certain standards, while others permit it as long as it does not affect other lights or driver visibility. Safety considerations include the risk of distraction to other drivers, potential miscoloring or glare at night, and the need for weatherproof, certified automotive parts and professional installation to avoid electrical faults or fire hazards.