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A fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor. The pressure inside the lamp is around 0.3% of atmospheric pressure. [27] The partial pressure of the mercury vapor alone is about 0.8 Pa (8 millionths of atmospheric pressure), in a T12 40-watt lamp. [28]
The energy-saving T12 lamps are made to operate on ballasts designed for 40-watt F40T12 lamps, though some F40T12 ballasts are not be designed to operate these lamps, and can overheat if energy-saving lamps are used. Running an energy-saving T8 tube with a ballast for T12 will reduce lamp life and can increase energy consumption. [9]
A compact fluorescent lamp ... for use with incandescent bulbs do not function acceptably below 40 W, ... for a 120 V 60 Hz 30-watt compact fluorescent lamp.
The 2009 IECC, chapter 2 defines high efficacy lamps as compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of: [21] 60 lumens per watt for lamps > 40 watts, 50 lumens per watt for lamps > 15 watts and ≤ 40 watts, and; 40 lumens per watt for lamps < 15 watts
He led the development of the Watt Miser (marketed as the F-40 Watt Miser), which was released in 1973. In 1976, he invented the first compact fluorescent lightbulb , but due to the difficulty of the manufacturing process for coating the interior of the spiral glass tube, GE did not manufacture or sell the device.
The Canadian federal government banned the import and sale of 75- and 100-watt incandescent bulbs, effective 1 January 2014. On 1 January 2015, 40- and 60-watt bulbs were also banned, although there are exceptions for oven lights, decorative lamps (light bulbs), appliance bulbs, 3-way fixtures, chandeliers and rough service/utility bulbs. [84]