3. Incandescent Lamp The incandescent light bulb, incandescent lamp or incandescent light globe is a source of electric light that works by incandescence (the emission of light by an object as a result of its being heated to a high temperature). An electric current passes through a thin filament, heating it to a temperature that produces light. The enclosing glass bulb contains either a vacuum or an inert gas to prevent oxidation of the hot filament. Incandescent bulbs are also sometimes called electric lamps, a term also applied to the original arc lamps.
4. Incandescent Lamp Parts Outline of Glass bulb Low pressure inert gas Tungsten filament Support wires Contact wires Stem (glass mount) Cap (sleeve) Insulation (vitrite) Electrical contact
5. Parts and functions contact wire - Electric conductor carrying the current to the filament. inert gas - Gas inserted in the bulb to slow down evaporation of the filament. base - Metal end of a lightbulb inserted into a socket to connect it to the electric circuit. (bayonet base ,screw base) stem - Button support. button - End of the stem; the filament supports are attached to it. support - Metal wire holding the filament. filament - Very thin metal wire, usually made of tungsten, emitting light rays when an electric current passes through it. bulb - Gas sealed in a glass envelope into which the luminous body of a lamp is inserted.
6. History (evolution) Platinum Filament 1801; 1809 Sir Humphy Davy Carbon Arc lamp 1840 Warren De la Rue Vacuum Tube enclosure 1841 Frederick de Molens Powdered Charcoal Filament 1854 Carbonised bamboo filament Heinrich Gobel 1873 Vacuum Tube enclosure Joseph Wilson Swan Gas filled “globe” 1875 Woodward & Evanx 1880 Thomas Edison Long lasting filament 1882 Lewis Latimer Better filament production 1910 William David Coolidge Tungsten Filament
7. Efficiency Approximately 90% of the power consumed by an incandescent light bulb is emitted as heat, rather than as visible light.
8. Incandescent vs. CFL 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 (less than 10% of the energy consumed by incandescent bulbs is for lighting). A fluorescent bulb on the other hand, contains a gas (mercury vapor) that produces invisible ultraviolet light (UV) when the gas is excited by electricity. The UV light hits the white coating (phosphor) 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 more energy efficient than regular incandescent bulbs.
9.
10. Types & Uses Decorative Chandelier light bulbs are not only for chandeliers. Many modern fixtures specify the use of a Type B light bulb. Fiesta Bulbs can be used in almost any light fixture where you use a regular light bulb. These bulbs add a bit of elegance to outdoor residential fixtures, and can add atmosphere to businesses like restaurants. Code Beacon light bulbs are a specialty bulb for radio and television towers. Rated for long life. The most popular is the 620PS40.
11. Photoflood light bulbs are specialty light bulbs for use in photography. These bulbs have a very intense white light. Half Mirror and Silverbowllight bulbs are used in restaurants, homes and other applications where glare reduction is needed. The top part of the bulb is chrome on the half mirror bulb and opaque white on the silverbowl bulbs. These bulbs reflect light up if used in an inverted position. Commonly used above restaurant tables, bathroom vanities, and other decorative applications where function and fashion are important. Rough Service Light Bulbs are often used in garage door openers, machines and applications where the bulb has to tolerate vibration
12. PS25 and PS35 light bulbs are very large incandescent bulbs with relatively high wattage ranging from 300-500 watts. These are often used in churches and buildings with older high wattage fixtures. Full spectrum and neodymium light bulbs reveal the true colors of objects in the lighted area. These bulbs simulate daylight and have whiter light than regular light bulbs. High and Low Voltage specialty bulbs. This category contains 12 volt and 220 volt light bulbs that look like a regular light bulb. The 12 volt versions are often used for recreational vehicles. Globe shape light bulbs are often used for bathroom vanities or in pendant fixtures. We stock the most popular sizes and wattages in both clear and white ranging from 1-1/8 to 5 inches in diameter.
13. Reflector Flood light bulbs are available in a wide range of sizes and wattages and are usually used in recessed can fixtures and track lighting. Colored Light Bulbs add atmosphere to businesses and are great for parties and holidays. We have a large selection of bulb types and colors including red, blue, green, amber, yellow and pink.
