https://www.xmtopstarlighting.com/products/filaments-a19-bulb/ LED A19 Filament Bulb, advanced automatic production, directly manufacture from China, high quality promise and long lifespan warranty. What Are A19 Filament Bulbs Used For? LED a19 led filament bulb work well with a variety of applications. You can see the usage of these LED filament light bulbs as ceiling lights, wall lights, vanity lights, kitchen lights, closet lights,porch light fixtures etc, also can be seperately installation in a E26 base for lighting.