Bulbrite 616053 53BT15SW/ECO 53-Watt Dimmable ECO Halogen BT15, Medium Base, Soft White (Pack of 4) Get the perfect light with the BT15 E26 Medium Screw 53 watt 120 volt Halogen light bulb. Box contains 1 bulb. Dimmable: Yes, Color Temperature: 2900K, Soft White Average hours: 1000, Beam Spread: 360, CRI: 100, Lumens: 1050, MOD: 1.875, MOL: 4.33