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A compact fluorescent lamp (CFL), also known as a compact fluorescent light bulb or an energy saving lightbulb, is a type of fluorescent lamp that fits into a standard light bulb socket or plugs into a small lighting fixture.
In comparison to incandescent light bulbs, CFLs have a longer rated life and use less electricity. CFLs typically save enough money in electricity costs to make up for their higher initial price within about 500 hours of use.
Modern CFLs typically have a life span specified between 8,000 and 15,000 hours[1]. Typical domestic incandescent bulbs are similarly specified to have a life of 1000 hours[2]. These lifetimes are often specified according to IEC60969[3], which specifies that "life to 50% of failures shall be not less than value declared by the manufacturer". In practice the lifetime of any actual light bulb, CFL or incandescent, depends on many factors including random statistical effects, manufacturing defects, exposure to voltage spikes, mechanical shock, frequency of cycling on and off, ambient operating temperature and many other factors.
The lifespan of a fluorescent lamp is not related to the number of hours it is on, but the number of times it is turned on. A typical fluorescent lamp lasts from 6000 to 7000 starts.
CFLs use about 20% of the power, and so in the simplest case when compared to incandescent bulbs, they can be responsible for about an 80% reduction in electricity costs and therefore also in the environmental impact of generating that electricity. For example, many 11-watt CFLs are specified to produce the same amount of light as 60-watt incandescent bulbs (approximately 900 lumens).
Such a simple calculation does not take into account the other effects of light bulb heat on energy costs. The energy consumed by any light bulb is ultimately converted into heat energy in its immediate environment. During cold months, the more power-hungry bulbs therefore help to heat buildings; but during hot months, they not only waste power directly, but may also place additional strain on air conditioning systems.
Even when the heat produced may be welcome, in many cases light bulbs do not provide it in the most efficient way. Light fittings are usually fixed high in the room, where convection will not help to distribute the heat to the occupants. Many buildings also generally use less expensive, more environmentally friendly or more efficient sources of heat than electricity for heating. |
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| Standard Batten 1 x 18 watt |
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| Standard Batten 2 x 18 watt |
| Standard Batten 2 x 36 watt |
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