On one of the lighting forums, people are consistently complaining on how their silverstar, and silverstar ultras fail so quickly. Even worse is when I called Sylvania and spoke to one of the lighting people that worked there he told me they aren't any brighter. So you are essentially paying two times the price for bulbs that are no more intense, and have a shorter life span. To compensate for the loss of light through the glass, they wing the filament tighter so it burns brighter, but that causes it to burn out quicker.