American Lighting Dimmable LED A15 Opaque Light Bulbs, E26 Medium Base, 2700K Warm White, 25-Pack Dimmable, LED replacement bulbs for indoor/outdoor light strings Professional grade LED lamps last 25,000 hours (6,250 days at 4-hours per day equals 17.1 years) Medium base, warm white 2700K color temp A15 bulb shape, 120-volts, 1.4-watts, 45-lumens 25-pack, medium base lamps, use with string light models: #LS-MS-24-48-BK or LS-M-24-48-BK