Originally Posted by bobski

All white incandescent (filament-based) bulbs get hot enough to evaporate their tungsten metal filament over time. Uneven metal loss creates hot spots on the filament, which evaporate faster until the filament breaks. Halogen bulbs add a gas (halogens being a group of elements on the periodic table) to the bulb envelope that bonds to the metal gas, forming a salt. When the salt hits the hot filament, it breaks down and re-deposits the metal, extending the filament's service life. This lets the Halogen bulbs run hotter (brighter, whiter light as well as faster metal evaporation) while retaining similar service life to non-halogen incandescent bulbs.

Silverstar bulbs run the filaments even hotter and even add a blue filter to the bulb glass to make the light even "whiter" (blue-er, increase the color temperature). There's no technological advancement involved - running the bulbs hotter reduces their service life. That's the sacrifice you make when going from the XtraVision line to Silverstar. Sylvania also pegs you as an impulse buyer when you make that jump, as even the base Silverstar (no fancy-ing letters or words) bulbs are around twice the price of XtraVision.

Originally Posted by Chitown Fit

All the more reason to switch from Halogen light bulbs to LED light bulbs.