Philips A21 3-Way LED light bulbs provide three lighting levels from 1600, 800, and 450 lumens when used with three-way fixtures. These energy saving bulbs offer the equivalent brightness of 100, 60, and 40-watts incandescent bulbs using just 18, 8, and 5 watts of power. These bulbs fit standard medium base (E26D) fixtures. At 2700-Kelvin, these soft white bulbs offer warm and comfortable lighting with high CRI (color rendering index) for exceptional clarity and comfort. Adjust the bulb for ultra-high, high, and medium output with 3-way lighting fixtures. Do not use with dimmers. Not compatible with Philips Hue products. These best-in-class, Energy Star Certified Philips LEDs provide steady, natural lighting at 1/4 of the energy of incandescents, 1/2 the energy of halogens and with 10X and 4X the lifespan respectively. Philips LEDs are mercury-free so they don’t contribute to harmful hazardous waste. LED light bulbs last up to 10X longer than incandescent and halogen bulbs. Unlike fluorescent and compact fluorescent bulbs, Philips LEDs are mercury-free so they don’t contribute to hazardous waste. Each bulb in this pack of 4 A21 Philips 3-Way LEDs is expected to deliver a lifetime of up to 25,000 hours and over 10 years (based on three hours per day), saving you the cost and hassle of frequent bulb replacement.