Hidden headlamp

Hidden headlamps, also commonly known as pop-up headlamps, pop-up headlights, flip-eye headlamps, or hideaway headlights, are a form of automotive lighting and an automotive styling feature that conceals an automobile's headlamps when they are not in use.

Depending on the design, the headlamps may be mounted in a housing that rotates so as to sit flush with the front end as on the Lamborghini Miura or Porsche 928, may retract into the hood and/or fenders as on the 1963–2004 Chevrolet Corvette, or may be concealed behind retractable or rotating grille panels as on the 1966-1970 Dodge Charger, 1970-1971 Mercury Cyclone, or the 1965 Buick Riviera.

History
Hidden headlamps first appeared on the Cord 810 in November 1935 at the New York Auto Show and shortly after on a custom example of the Alfa Romeo 8C in 1936. In the Cord, a pair of cranks on either side of the dashboard could be turned by hand to bring out the headlamps when needed. Powered hidden headlamps first appeared on GM's concept car in 1938, the Buick Y-Job, and appeared on concept cars for several years after, including the 1951 General Motors Le Sabre. However, power hidden headlamps would not appear on a production vehicle until 1962 with the Lotus Elan. The popularity of this feature has waxed and waned over time. Hidden headlamps regained popularity in the mid-to-late 1960s, first in Europe but particularly in the US where aerodynamic headlamps were not permitted. A relatively large variety of cars incorporated hidden headlamps in the 1970s, 1980s, 1990s, and up to the early 2000s. Subsequent legislation led to hidden headlamps falling increasingly out of favor.

In the past, manufacturers often used hidden headlamps to circumvent headlight height regulations in the United States. For instance, in 1983, Toyota exported their retractable headlight version of the AE86 (known domestically as the Sprinter Trueno) instead of the Corolla Levin, as the former had a higher headlamp height, enough to satisfy US regulations. This prevented them from needing to raise the body height of the car, which would have affected handling.

Discontinuation
US laws now permit aerodynamic headlamps, relative to which hidden headlamps represent added cost, weight, and complexity as well as reliability concerns as cars age. Internationalized ECE auto safety regulations have also recently incorporated pedestrian-protection provisions restricting protuberances from car bodies, making it more difficult and expensive to design compliant pop-up headlamps.

The last time pop-up headlamps appeared on a volume-production car was in 2004, when both the Lotus Esprit and Chevrolet Corvette (C5) ended production. Development of both projector beam headlamps such as those on the 1990 Nissan 300ZX (Z32), and more efficient, bright LED headlamps has in practice, eliminated the need for hidden headlamps altogether.

Despite new cars no longer offering hidden headlamps since 2004, hidden headlamps are not outright banned, and as such, they can be still be installed on vehicles today such as the Ares Design Project1.

Other vehicles with hidden headlamps
Although most hidden headlamps are installed on cars, they have also been installed on other types of vehicles. These include motorcycles such as the Honda Elite 150, some coaches such as Pegaso-Obradors and trains such as the Keisei AE100.