Simply H1, H3, H4, H7 halogen bulb is the vehicle's specifications.  Only H4 double-wick lamp, which means it has both near and far light lamp, suitable for use in single-lamp (or so each) of the vehicles.

H = Type (size) V = Voltage W = W K = the number of color temperature

The H1, H3, H7 bulbs are single wick, which is only one bulb for lamps, lights, or just simply providing distant past lights, for example: H7 are usually used in the last light, H1 is used in the beam lights, dual lamps for vehicles (two on each side); The H3 is used in the fog, so the volume will be significantly smaller.

In addition to these types of patterns, there are 9004,9005,9006 and other European regulatory light bulb.

Color Temperature Commentary:

Color temperature of the temperature of the name suggests is a variety of colors, light colors are used to measure units of measure, measurement will be the basis for the "ideal black body" of the black body heated to enable it to issue the same color light and the light source when the temperature measurement to ° K (Kelvin) that measures the color temperature can be "color table" to calculate a more precise measurement is simple, the color temperature is high, bluish color, purple, known as "cold colors" (Cold Tone) color temperature is low, the color yellow, red , known as the "warm" (Warm Tone).

Change the color temperature of light sources commonly used: the clear blue skies 12,000 ~ 25,000 ° K, at the shade of 10,000 ° K, the blue and white 8,000 ~ 10,000 ° K, cloudy 6,500 ~ 7,500 ° K, daylight-type fluorescent lamp 6,500 ° K, Daylight 5,500 ° K, electronic flash 5,500 ° K, flashbulbs 4,200 ~ 5,000 ° K, morning or afternoon sun 4,000 ~ 5,000 ° K, fluorescent Cool White 4,500 ° K, warm white tone fluorescent 3,500 ° K, 3400K studio lighting 3,400 ° K, quartz lamp 3,300 ° K, studio lighting 3,200 ° K, incandescent light bulbs 2,700 ~ 3,200 ° K, dawn, dusk 2,000 ~ 3,000 ° K, candlelight 1900 ° K, LED fog lights with the traditional light bulb.

First, the fog lights on both sides must talk about .1. Light penetration 2. The light of the distance. These two have each have their own role, the former is used to penetrate the fog layer, which is used to let others see their own Oh!

Penetrating, the easiest way to achieve the low color temperature, color temperature, the lower the better penetration. For example, yellow is the presentation of low color temperature, so the general use of fog lights are yellow shade, while the blue because it is the high color temperature, so many big lantern is not rosy shade with blue and white is in between. So It is only in the middle of penetrating to the seat.

Under normal circumstances, LED's through the fog of higher than conventional bulbs, because the LED is a highly directional light, so that higher illumination than conventional bulbs, fog will wear more, although the words to say, but the drawback is that LED is a directional light source, and therefore can not focus, in other words, can not be strengthened and focused through the reflector reflectivity, which is seldom used in fog lights LED reasons.

As the distance light will affect the power of fog is observed. This part of the effect of LED light bulbs higher than the more traditional, like that of Taiwan's traffic lights, LED light almost completely replace the traditional light bulb. This is because the LED lights Although not so bright as halogen lamps or light bulbs, but the non-LED light source into the case, will be a very serious recession with distance (laser excluded), contrast, LED was able to be seen clearly in the distance.

Therefore, not only the traffic lights changed to LED bulbs in general, and even many new car models have the LED brake light bulb as a choice.

Incidentally: headlights, fog lights because it is focused on lighting, so most of the traditional light bulb. Brake lights, turn signals, taillights because it is light, want to be seen, so multi-purpose LED.

Conclusion:

If you need to focus the light species (concentration of a point light), the traditional light bulb better.

If you need to be seen in the light species (see any point light source), LED light bulbs better penetration of fog in yellow> white> blue.

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