The Earthmate T2 spiral is the next generation in compact fluorescent lamp (CFL) miniaturization. The reduced tube size allows for a shorter maximum overall length (MOL), allowing the light bulb to fit in more applications. While all compact fluorescents contain some mercury (so should be disposed of properly), this T2 CFL has only about 1 milligram of mercury, which is less than most other CFLs, making it even better for the environment. This bulb is approximately equivalent in light output to a 40 to 60 watt incandescent light bulb.LIGHTING SPECIFICATIONS Type: fluorescent Shape: Spiral Light Output: 825 lumens Efficacy: 63.5 lm/w Color Temperature: 2,700 degrees Kelvin Color Rendering: 82 CRI Rated Average Life: 10,000 hours Dimmable: No Three-way: No Minimum Start Temperature: 0 degrees Fahrenheit (-17 degrees Celsius) Maximum Operating Temperature: 105 degrees Fahrenheit (40 degrees Celsius) Average Mercury Content: 1 milligram Base Type: E26 medium screw base GENERAL SPECIFICATIONS Input Power: 120 volts AC Power Consumption: 13 watts Width: 1.6 inches (41 mm) Length: 3.9 inches (99 mm) ENERGY STAR Qualified: Yes UL Listed: Yes Packaging: Recycled Paperboard (100% post-consumer) Manufacturer Warranty: 2 years Origin: China Note that this bulb may have reduced rated life in enclosed fixtures or emergency exit lights, and is not suitable in outdoor locations where it would be exposed to the elements, or in conjunction with dimmers, photocells, or electronic timers. This lamp contains mercury. Please recycle at the end of its life.