Is It Dangerous When the Light Is Off but Still Glows Slightly?
3 Answers
It is quite common for the light to still glow slightly when turned off. The reasons are as follows: 1. Capacitor step-down current limiting method: The driver of this LED light uses a very simple capacitor step-down current limiting method, rather than a dedicated and standard isolated switching constant current source; 2. Induced electricity: Although the switch is installed on the live wire, the neutral wire is only at 0 potential relative to the live wire and actually may still have a certain voltage, or induced electricity generated by other circuits. Combined with the high luminous efficiency of small-power LED lights; 3. Discharge causing flickering: After the power is turned off, the fluorescence or accumulated induced electricity discharges to a certain extent, resulting in flickering, which is understandable.
As an enthusiast who frequently tinkers with automotive electrical systems, I believe that dim residual glow after lights are turned off does pose risks. Commonly referred to as 'phantom lighting,' this phenomenon is typically caused by faulty relays or current leakage in wiring. It gradually drains the battery, potentially leaving the vehicle unable to start during critical moments and even shortening battery lifespan. More concerningly, if the issue stems from short circuits or overheated connectors, it may create fire hazards – I've personally seen forum cases where this burned out light housings. I recommend promptly inspecting relays and fuse boxes, replacing components when necessary, before the situation escalates and compromises driving safety.
As an ordinary car owner, I find this situation quite concerning. Although the glow may seem weak, continuous discharge can drain the battery unnoticed, potentially causing sudden breakdowns in the morning and delaying work or school. If it's residual light from the headlights, it might flicker during night driving, distracting other drivers and increasing accident risks. I think it's best to first check if the fuse is blown or have someone test it with a multimeter. Timely repairs can prevent major troubles. Safety first—don't take it lightly.
