Join Date: Dec 2010
Location: Ontario, Canada
Drive 2011 Tuscon Ltd., 2014 Subaru XV AWD, Honda Prelude, Honda CRV
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Try to make it as simple as possible
Tuc oem use H4 bulb, which has 2 filaments, 1 for hi, 1 for low beam. It is a cheap way to eliminate the use of 2 separate bulbs. See photo 1.
In Canada, the hi is also used as daylight driving light under reduced voltage.
In Hid application, for Canadian config with DRL, we use bulb H-4-2 the bulb has 1 fliament for HID xenon low beam, 1 halogen bulb for Hi beam. See photo 2, the small white base bulb next to the filament. (hid cannot operate with reduced voltage)
There are other variation of H4, such as bi-xenon. a trigger control both hi lo are xenon, not for us unless we re-wire the fog light to be DRL.
Or Hi xenon, Lo halogen which is not practical
If you are un-familiar with these, get professional installation. Make sure to ask for "Hi halogen, Lo xenon"
Another advice, those selling at $50-90 are all made in China, even though the seller may appear as in USA, they ship from China to you. Not that the Chinese made are that bad. If you buy a Philips, will be over $200, Should last a few years if you dont get it wet or not that much night driving.
35watt will be enough, 55watt may lead to premature aging of your lens due to more heat.