Well, every site says the performance is the same its just a different base, I will get the H7 for now and hope the 35w ballasts are enough .
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The Philips and osram lamps are far superior, using quality electrodes and salts, this is why they offer vastly greater performance without defects in the beam pattern, a lot of research and funds have gone into the development of the branded items.
D2S are used in projector lenses
D2R are used in reflector lenses
I’ve not heard of D2H (not branded anyway)
Honda and landrover at one time used D2R bulbs in reflector housings on some models and trim levels, (some early discovery3 models and later civics in particular), D2R are rarely used if at all now,
Both D2S & D2R look essentially the same, apart from the notches on the base being in different positions and D2R using a small shield directly painted on the glass of the bulb to prevent glare in the reflector lens.
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