Energy efficient: These Energy efficient LED bulbs replace PL-C/T Fluorescents and have an estimated annual energy cost of 1.26 dollars. Philips LED light bulbs are Mercury free and Energy Star Certified. Long lasting: These Philips LED bulbs last 13x longer than fluorescent bulbs. Each light bulb is expected to deliver a lifetime of up to 36 000 hours of light (based on three hours per day), saving you the cost of frequent bulb replacement. Soft white: Philips PL-C/T Light Bulbs offer warm and comfortable lighting with high CRI (color rendering index). At 2700 Kelvin the bulbs deliver bright crisp color Smooth dimming: Philips dimmable LED bulbs are flicker-free silent, and tested to work with more dimmer switches than any other LED bulb on the market. These PL-C/T Light Bulbs light bulbs smoothly dim from 2700K down to a soft glow with greater clarity than traditional fluorescent bulbs.