A-23 bulb with a medium base (E26) Provides neutral white light Estimated life of 22.2 years based on 3 hours of use per day Brand Philips - Part No. 35658-4 - Order Code H38MP-100/DX - Wattage 100 Watt - ANSI Code H38 - Bulb Shape A23 - Base Type Medium E26 - Color Temperature 3700 Kelvin - CRI 45 - Length 5.438 in. - Diameter 2.875 in. - Life Hours 24000 - Lumens Initial 4400 - Burn Position Universal -