What are the differences between halogen headlights and LED headlights?

[DelRose]

Here are the specific differences between halogen headlights and LED headlights: 1. Light emission principle: Halogen lamps use tungsten filaments to emit light, while LED headlights use light-emitting diodes. 2. Energy consumption: Halogen lamps consume the most energy, typically 55W in vehicles, whereas LED headlights consume around 20W. 3. Brightness: Halogen lamps are less bright, with 55W producing over 1000 lumens, while current LED headlights with 20W can achieve 3000-4000 lumens. 4. Lifespan: The typical lifespan of a halogen lamp is 500 hours, while the lifespan of LED headlights is currently hard to determine due to immature technology, but theoretically it can reach around 50,000 hours.

[MacMaci]

Over the past decade, I've driven cars with various types of lights. Halogen lights are like old-fashioned household bulbs—they light up slowly and emit a yellowish glow, but they have exceptional penetration in rainy or foggy conditions. LED lights reach full brightness instantly upon startup, with white illumination that makes road signs reflect clearly, though they can be glaring in heavy fog. Last year when I was driving on mountain roads, after upgrading from factory halogen to LED lights, the low beams illuminated half a lane wider, but the high beams caused tree shadows to suddenly appear, requiring readjustment to judge distances. Halogen lights cost just 20 yuan to replace a bulb, while a broken LED requires replacing the entire assembly, which can cost over a thousand yuan—truly painful. A reminder: directly swapping bulbs for LEDs without changing the lens is considered illegal modification if caught by traffic police.

[TessaMarie]

As a mom who drives kids every day, I particularly care about the reaction speed of car lights. LED lights illuminate instantly when turned on, providing quick lighting when reversing; halogen lights take two to three seconds to fully brighten. Once, when temporarily parked in an underground garage, I couldn't even see the keyhole with halogen lights. However, LED white light makes it hard to see water reflections on the ground during rain—last week during a heavy downpour, I had to lower the light's color temperature to drive safely. The difference in power consumption is significant: back when I used halogen lights, I spent extra on fuel each month—enough for a milk tea—but now the electricity saved with LEDs is enough to buy my child two packs of stickers. For those who often drive at night, I recommend installing LEDs, but for those living in suburban areas, keeping halogen fog lights is more reliable.

[AshleyDella]

From a thermal perspective, halogen lamps convert 85% of their energy into heat, making the engine hood too hot to touch in summer when the lights are on. LED cold lighting maintains a temperature of only around 35°C, which significantly impacts the aging rate of lamp covers. The difference in luminous efficacy is even more astonishing: a 55W halogen lamp produces just 1000 lumens, while an LED with the same brightness consumes only 15W. Last year's real-world testing on the same road section showed that the reflective intensity of road signs at 25 meters under LED low beams was three times that of halogen lamps. However, poor heat dissipation in LEDs can lead to lumen degradation, as seen in a certain German car model whose lights dimmed to 'candlelight' levels after three years. When upgrading lights, don’t just focus on brightness—heat sink size and LED chip arrangement determine how long they will last.