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| Fluorescent lamps are more efficient than incandescent light bulbs of an equivalent brightness. This is because a greater proportion of the power used is converted to usable light and a smaller proportion is converted to heat, allowing fluorescent lamps to run cooler. A typical 100 Watt tungsten filament incandescent lamp may convert only 2.6% of its power input to visible light, whereas typical fluorescent lamps convert between 6.6% and 15.2% of their power input to visible light - see the table in the luminous efficacy article. Typically a fluorescent lamp will last between 10 to 20 times as long as an equivalent incandescent lamp. |
| Fixed Low Profile Compact Fluorescent Downlight |
- Made in Italy
- White polycarbonate trim
- Vacuum sealed metalised polycarbonate reflector
- Low glare, metalized louvre
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| Adjustable Metal Halide Gimbal Downlight |
- 70W or 150W adjustable metal halide adjustable gimbal downlight
- Die-cast aluminium construction
- UV filtered clear glass safety glass
- 350º rotation
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| 400W Metal Halide Crombay High Bay Light Fitting |
- White powder coated metal housing
- Integral control gear / lampholder
- Aluminium reflector
- Hook flex and plug
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The higher initial cost of a fluorescent lamp is usually more than compensated for by lower energy consumption over its life. The longer life may also reduce lamp replacement costs, providing additional saving especially where labour is costly. Therefore it is widely used by businesses worldwide, but not so much by households.
How does a compact fluorescent light bulb work?
Fluorescent light bulbs (including compact fluorescents) are more energy-efficient than regular bulbs because of the different method they use to produce light. Regular bulbs (also known as incandescent bulbs) create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. A lot of the energy used to create the heat that lights an incandescent bulb is wasted. A fluorescent bulb, on the other hand, contains a gas that produces invisible ultraviolet light (UV) when the gas is excited by electricity. The UV light hits the white coating inside the fluorescent bulb and the coating changes it into light you can see. Because fluorescent bulbs don't use heat to create light, they are far more energy-efficient than regular incandescent bulbs.
Metal halide lamps, a member of the high-intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. Originally created in the late 1960's for industrial use, metal halide lamps are now available in numerous sizes and configurations for commercial and residential applications. Like most HID lamps, metal halide lamps operate under high pressure and temperature, and require special fixtures to operate safely. They are also considered a "point" light source, so reflective luminaires are often required to concentrate the light for purposes of the lighting application. |
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