Yes, filament bulbs of course. Anyone who knows anything about headlight bulbs know Sylvania Silver Stars are incandescent bulbs. If you hold them in your hands (by the base only, oils on the glass generate hotspots that reduce the life of the bulbs), you'll easily see the filament inside. If you go to any auto parts outlet and see bulbs packaged in blister packages, it is super easy to see which are LED or built as a standard lamp.