G9 match base here. Use on 120 volt fixtures only. Halogen lighting data. 120 v. Energy Used: 40 watts. Average Life: 2,000 hours. 40 Watt 120 Volt Halogen with G9 Base: This halogen bulb offers substantial energy savings and expanded light output over standard lamps. Its brilliance, compact size and optimum color rendition make this lamp ideal for accent lighting, display lighting and task lighting. www.feit.com. Made in China.