A roundup of one of the more useful lighting fixtures: the clip-on lamp, ranging from the humble hardware store clamp lamps to more stylish versions.

Above: Cornet Clip Lamp; made of glazed porcelain by Paris-based Tse & Tse; $195 at Horne.

Above: BTC Original Hector Clip-On Light with porcelain shade, £57 at Geoffrey Harris Lighting.

Above: Fas Clamp Spotlight; $9.99 at Ikea.

Above: Artemide's Tolomeo Clip Spot Light; $175 at Y Lighting.

Above: Made of powder-coated sheet metal, the industrial French-Style Clip Light; £29.95 at DesignShop UK.

Above: Lumina Naomi Pinza Lamp; $224.80 at All Modern Lighting.

Above: Fluker's Clamp Lamp; $9.97 at Petco.

Above: Black Gooseneck Clip Lamp (also in white or chrome); $19.95 (down from $23.99) at Lamps Plus.

Above L: Porcelain Socket Clamp Lamp; $17.32 at Sugar Gliders. Above R: Designer's Edge Clamp Light; $8.97 at Home Depot.