Demon eyes are a type of decorative lighting retrofit for automotive headlamps. They typically refer to coloured light sources installed within the projector lens, illuminating the entire glass element to mimic an eyeball effect, and are frequently mentioned alongside "angel eyes".
Structurally, there is a clear distinction between demon eyes and angel eyes. While angel eyes usually feature a circular halo ring fitted around the outer rim of the projector shroud, demon eyes are installed inside the projector unit itself. Light from the internal source refracts through the spherical projector lens, bathing the entire glass in a distinct colour to create the visual appearance of an illuminated eyeball. Consequently, the prerequisite for installing demon eyes is that the vehicle must already come equipped with projector lenses, or have an aftermarket projector assembly retrofitted.
In terms of colour options, early demon eyes were predominantly red—hence the name "Red Demon Eyes"—before expanding to include alternatives such as purple, blue, and green.
Functionally, demon eyes serve as decorative position lights or daytime running lights (DRLs), playing a role identical to that of angel eyes. They do not provide primary road illumination. In practice, demon eyes generally operate under two wiring setups: one functions as independent position lights that illuminate whenever the small lights are engaged; the other is wired in tandem with the low beams, automatically turning off once the low beams are switched on to prevent interference with normal beam projection.
There are contradictory claims regarding whether demon eyes can clear mandatory vehicle roadworthiness inspections (PUSPAKOM/annual inspections), which should be examined objectively:
The argument that they do not affect inspection: Some references suggest that "retrofitting angel eyes or demon eyes does not compromise vehicle inspection compliance, as guidelines strictly govern beam output and performance rather than cosmetic aesthetics".
The argument that they fail inspection: Conversely, most recent sources take the opposite view. Several references explicitly cite "headlamps retrofitted with red, blue, or green demon eyes or angel eyes" as significant cosmetic discrepancies against the vehicle registration card/grant photo, advising owners to avoid them. Other industry feedback notes that merely swapping bulbs or introducing non-standard decorative illumination (including demon eyes and angel eyes) constitutes an illegal modification, resulting in an inspection failure as well as the risk of summons from the traffic police.
From a regulatory standpoint, the legality of demon eyes hinges on whether they alter the vehicle’s factory-homologated lamp colours and exterior appearance. In accordance with the "Road Traffic Safety Law of the People's Republic of China" and GB 4785 standards, automotive lighting must strictly conform to original factory-approved homologation specs, with headlamps permitted only in white or yellow; any unauthorised installation of coloured cosmetic lights breaches original technical parameters. Whether configured as position lamps or DRLs, non-standard hues—particularly red and purple—depart significantly from factory specifications, posing a high risk of failing vehicle inspections. While enforcement stringency may vary between testing centres, reverting the headlamp setup to its stock condition remains the safest course of action to ensure compliance.
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