So which are the bulbs to buy ... We headed to Philips' testing facility in Aachen, Germany, to find out. For this test we have concentrated on the single filament H1 and H7 types.
The 200 per cent-brighter Halfords Advanced bulb managed an improvement of 185 per cent in the FOM assessment over the ...
A website touting the Sylvania SilverStar headlight bulb says it provides ... and dual-filament (H7) bulbs from GE, Hella, Philips, and Sylvania, and PIAA's dual-filament bulb.
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