The H1 is a single filament bulb. It is used as a low beam, high beam and fog light bulb. This depends on the year, make and model of the vehicle you are driving.
Upgrading the lights with the H1 LED bulbs you will get noticeably brighter lighting. This kit operates on 30W which does not allow overloading the electric system of the vehicle. Lower power consumption means low gas consumption. You will not have to wait while the lights are warming up. You will get the full brightness of the light instantly due to Cree Chips that are used. These chips make the LEDs brighter offer the most lumens per watt.
The heat sinks, which are made of special aluminum alloy, and built in fan are excellent cooling system that allows keeping the bulb cold to the touch even after hours of work. Low operating temperature prolongs the lifespan of the kit. Average lifespan of the LED set is around 50000 hours.
The H1 LEDs are the best choice for the reflector housing. Cree Chips will increase not only the visibility but allows choosing one of free colors. The kit comes with 2 sets of color filters (blue and yellow), but the bulbs can be used without them to get the brightest white light output.