Chromalux 3-Way Light Bulb, 50/100/150wattFrosted or ClearAverage life: 4000 hours.Description: Chromalux Light Bulbs are long-life light bulbs that offer full spectrum lighting, which closely imitates natural daylight, reduces yellow glare, increases black and white contrast, improves readability, lessens eye strain, and helps promote a sense of well-being. 50/100/150watt