12V55W headlamps bulb every night to open five or six hours, half a month to burn, can add resistance and the like, so that the bulb does not burn it? Can sacrifice point brightness!
Choose a good point of the brand, as if the Philips car H7 has a long life, and before the first check the next circuit, because the bulb burned a lot of reasons, it is difficult to easily conclusions
This is mainly the installation of the problem, do not use the lamp directly to take, bring gloves, bulb oil burned fast
There is a way! Go to the electronics market to buy a thyristor to remember the kind of metal to the time will be very powerful heat, and then buy a large point of the diode, preferably n4007 and 4188 and then use three
Install resistance to choke. 12V55W bulb normal current is about 4.6A, then the resistance of the power P = 4.6 * 4.6 * R (resistance). The market so much resistance to the power of a little hard to buy, generally more than 2W in the following. It is recommended that you buy two high-power bulbs in series with (also a bit hard to find) or find someone to design an electronic step-down circuit buck.
