The knowledge that they burn out quickly.
Honda-Tech Forums: "Silverstars suck. They burn out quick"
RedFlag Deals: "Silverstars burn out easy"
Amazon Review: "Great light - burns out very quickly!'
Amazon 2: "The two I purchased burned out within 4 months, and that gets very expensive quickly."
Amazon 3: "And the bulbs both burned out less than 12 months after installation (they failed within a day of each other)."
Amazon 4: "Both lamps burned out within a week of each other - 6 months after they were installed. "
Amazon 5: "These bulbs are whiter and slightly brighter than my originals, but four bulbs have burned out and I am on my third set in less than a year. I asked Sylvania customer support what is the expected lifetime and they told me the bulbs should last for at least one year of normal use. I consider this to be extremely short, but when the first bulb failed at 4 weeks, the second at 6 weeks, the third at 6 months and the 4th at 9 months. I wrote to Sylvania customer support with a copy of my sales receipt and they sent free replacements. I will try a different model when these burn out."
Amazon 6: "These burn out fast. Very fast."
RSX Forums: "It's only the silverstars that burn out too soon."
Fatwallet Forums: "I had both of mine burn out within 4 months. When my second one burned out, I got a ticket for $54 for maintenance of lamps."
Civic Forums: "However, after 8 months, one side has already burned out, and after 12 months the other side also burned out."
Mindful Musings: "These Sylvania SilverStar headlights burn out about once a year."
Nissan Forums: "Just wondering for I have read the Sylvania Silverstars available in Canada don't last long at all and burn out very quickly, ..."
Need I continue?