They are used for low light beam and also high beam. In comparison to H1 light bulbs, H7 light bulbs have a higher luminosity, lower power usage and much better light high quality.
The 2nd kind is the H4 bulb with two filaments, one for reduced light beam as well as one for high beam of light.
Posted by miquelbou 48 days ago (https://194ledbulbwhite.wordpress.com)
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