Sylvania used to be a Philips daughter but was abandoned. I know nothing about the quality.
For the time being I would not go LED but await further developments. Led needs relatively little energy and can generate much light. But... other drivers than you can also have led lights and there lies one of the problems. Glare over the mirrors is frequent, the more when there's a SUV or a truck on high wheels behind you or when cars go over a speed bump. You'll be blinded and for seconds will not see anything. The British RAC held a survey last winter: 67% of their members complained about the glare of the new headlights. Predecessor Xenon was also annoying triggering migraine attacks with people susceptible for this. The colour - both Xenon and Led tend to blue - is maybe a factor. The human eye prefers the somewhat more yellowish light that conventional bulbs and halogen offer. When hit directly by these new lights, this is what happens: the light will reflect by the fluid in the eyeball resulting in stray light on the retina > all of a sudden you're in a fog, even more so when the eyefluid is a bit mirky which is with all of us when we get older. What does not help either, is that the pupil that meets bright light, will contract fast but, with the light disappearing, will dilate much and much slower. That's how we are built. Also an annoying afterimage can occur being an 'imprint' of the lightsource but than in negative. All this together can result in seeing nothing for seconds, an unwanted situation whilst driving.
