Zoo Med’s most popular Clamp Lamp fixture is available in three sizes: 5.5″ (14 cm), 8.5″ (22 cm), or 10″ (25 cm) diameter domes. Made of heavy gauge painted aluminum. All three models have a ceramic socket, and can be used with the Clamp Lamp Safety Cover to protect your bulbs, animals, and home. All three models have a ceramic socket, and can be used with the Clamp Lamp Safety Cover to protect your bulbs, animals, and home. This fixture can handle incandescent bulbs up to 100 watts. Available Size: Size: 5.5″: Wattage: 100 w Size: 8.5″: Wattage: 150 w