The Grandrich ES-101 and ES-201 EZ Reader 27-watt fluorescent replacement bulb simulates outdoor sunlight, which is balanced across the entire spectrum of color visible to the human eye. This is the clearest, brightest, and most comfortable lighting you will ever use. Full-spectrum light helps reduce eye strain, provides more vivid colors and better contrast for reading, and creates sharp visibility for more detail. It is glare free making it ideal for computer use. The 10,000 hour bulb life lasts 6-10 times longer than standard bulbs and yet uses two-thirds less energy than an equivalent 100-watt incandescent bulb. This bulb will not hum or flicker and is a safe and cool alternative to incandescent and halogen bulbs. The bulb insures you will see more comfortably for reading, working, and all close up tasks and hobbies. It has earned the Energy Star certification.--Bree NorlanderWhat"s in the Box One Grandrich PL-27W EZ Reader 27-watt fluorescent bulb