Review on SYLVANIA XtraVision Halogen Headlight Contains Motorcycle & Powersports by David Sanchez

Most people's claims are paradoxical. You want the brightest, the ones that last the longest and are economical too! That does not happen! If you want even brighter, go for the GE Nighthawk Sport or Sylvania Silverstar - they're a bit brighter but have a shorter lifespan. [Only HID will be really brighter with longer lifespan. But then you'll need custom builds - there are no ready-made kits to replace the H4666. And LEDs are still not available except for a fancy finish.] BRIGHTNESS: If you had really old lightbulbs, they'll seem a lot brighter. Something else. I find them just as bright as neighboring new cars (except Premium). SPREAD: Spread is much better to the sides (particularly to the right) than the OEM, and also slightly more forward. DURABILITY: Extrapolated durability is twice that of OEM and Silverstar - but only time will tell. The lens is made of glass and does not fog up. The brightness of a headlight really depends on several factors: (1) the bulb itself. Older filaments gradually become thinner and offer more resistance, hence lower currents. (2) the reflection coefficient of the reflector. They lose their reflectivity with age and need to be replaced about every 5 years. (3) Lens transparency. (Never use ammonia-based auto glass cleaners - they cloud the plastic). OEM Wagner was plastic - it's glass (4) fuse. Older fuses have higher resistance and lower voltage across the headlights - they should be replaced regularly (some use higher rated fuses to improve lighting - NOT recommended). possibly replace the headlight fuse with a new one).