Can I install this H1 LED Bulb with the original adapter?
Yes, absolutely, please use the factory adapter, do not need any aftermarket retainer/adapter.
How do I know these LED bulbs fit for my car?
There are 3 ways to know that. First, select your vehicle model/make/year in the filter system of the prodcut detail page, Second, check your cars manual, the part number on your original bulbs. Third, search "automotive bulb look-up" online.
Why does LASFIT led bulbs have a lower luminous flux than others on Amazon but actually glows better?
The most seller claims that their products have a luminous flux of 1W=200LM or above, but at present the most advanced technology is 1W=140LM. LASFIT L1plus series led bulbs have truly achieved the high luminous flux of 1W=100LM.
Will these work as high/low forward light bulb?
Yes, If you original halogen bulb is H1, then this H1 led bulb will fit. The H1 led bulb can be used as High/Low forward light, fog light bulb, it depends on your vehicle.