When changing car headlights, you must know the knowledge about lights

Click here to view all news pictures

H=type (specification) V=voltage W=wattage K=color temperature

Simply put, H1, H3, H4, and H7 refer to the specifications of halogen bulbs for vehicles.

Among them, only H4 is a double-wick bulb, which means that it has both near light and far light, which is suitable for vehicles with single lamps (one on the left and one on the left).

Related reading:
Refitting xenon lamps has skills to elaborate on the misunderstandings of xenon lamps
Guide to buying car lights for safe driving
Weather determines the purpose of the modification CarXenon headlights don't be too dazzling

H1, H3, and H7 are all single wick bulbs, that is, there is only one wick in the bulb, which only provides far light or near light. For example, H7 is usually used for low beam, and H1 is used for high beam. Lamp, suitable for dual lamps (two on each side); as for H3, it is used inFog lights, So the volume will be significantly smaller.

In addition to these types, there are 9004, 9005, 9006 and other European standard bulbs.

Color temperature explanation:

Color temperature, as the name implies, is the temperature of various colors. It is a unit of measurement used to measure the color of a light source. The measurement basis is the temperature at which a pure black object of "ideal black body" is heated to make it emit light of the same color as the light source. The unit of measurement is °K. (Kelvin) said that the color temperature can be measured with a "color temperature meter" to measure and calculate more accurately and easily. When the color temperature is higher, the color is blue and purple. It is called "ColdTone". When the color temperature is lower, the color is yellow and red. Called "WarmTone" (WarmTone).

Color temperature changes of common light sources

Clear blue sky 12,000~25,000°K, shade 10,000°K, blue sky and white clouds 8,000~10,000°K, cloudy 6,500~7,500°K, daylight fluorescent light 6,500°K, daylight 5,500°K, electronic flash 5,500°K, flash Bub 4,200~5,000°K, morning or afternoon sunlight 4,000~5,000°K, white cold-tuning fluorescent lamp 4,500°K, white warm-tuning fluorescent lamp 3,500°K, 3400K studio lighting 3,400°K, quartz lamp 3,300°K, studio lighting 3,200°K, tungsten bulb 2,700~3,200°K, dawn and dusk 2,000~3,000°K, candle light 1900°K, LED and traditional bulb fog light.

First of all, fog lights must first talk about two aspects.

1. Light penetration

2. The distance of the light

Both of the above have their own functions. The former is used to penetrate the fog layer, and the latter is used to let others see you!

Penetration, the easiest way is to achieve low color temperature, the lower the color temperature, the better the penetration.

For example, yellow is the appearance of low color temperature, so generally fog lamps use yellow shades, and because of the high color temperature of blue, many unobtrusive headlights will use blue shades, and white is in between. So Its penetration is only in the middle position.

Under normal circumstances, the fog penetration of LED is higher than that of traditional light bulbs. Because LED is a highly directional light-emitting body, it is said that the illuminance is higher than traditional bulbs, and the fog penetration is stronger. Although that is said, it has disadvantages Because the LED is a directional light source, it cannot be focused. In other words, it cannot be strengthened and concentrated reflection through the reflector. This is the reason why LEDs are less used in fog lamps.

As for the distance of the light, it will affect the observability of the fog lamp. The effect of this part of the LED is much higher than that of the traditional light bulb. For example, the traffic light in Taiwan, the LED light almost completely replaces the traditional light bulb. This is because the LED light Although it is not as bright as a halogen lamp or light bulb, if it is replaced with a non-LED light source, it will decline very severely with distance (except for lasers). On the other hand, LEDs can be clearly seen from a distance.

Therefore, not only the traffic lights are generally changed to LED bulbs, but even many new car models use LED bulbs as the choice of brake lights.

Incidentally:

Because the headlights and fog lights are concentrated lighting, most of them use traditional light bulbs.

Brake lights, direction lights,TaillightBecause it is an indicator light, you want to be seen, so use LED more.

Conclusion:

If you need to focus on the type of lamp (focusing on the brightness of a certain point), traditional bulbs are better.

If you need to see the lamp type (the light source can be seen at any point), the LED bulb is better, and the penetrability of the fog lamp is yellow>white>blue.