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What do the letters on light bulbs mean?
The code number of a bulb consists of a letter or letters followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. The mosts commonly used household bulb is the A-19. A 65BR40 is a 65 watt reflector 5″ in diameter.
What do you understand by lighting?
Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Lighting can also be an intrinsic component of landscape projects.
What does B bulb mean?
Candelabra bulbs
B-shaped bulbs are also known as Candelabra bulbs. Bulbs with this shape have a bulged base that attenuates to a rounded tip. The bulbs of this shape are very wide-spread in chandeliers, night lights, and lower wattage applications. PAR-shaped bulbs.
How does the light bulb work?
In an incandescent type of bulb, an electric current is passed through a thin metal filament, heating the filament until it glows and produces light. After the electricity has made its way through the tungsten filament, it goes down another wire and out of the bulb via the metal portion at the side of the socket.
What are the codes for light bulbs?
Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
- A15 bulb: 15/8 = 1-7/8″ diameter.
- A19 bulb: 19/8 = 2-3/8″ diameter.
- A21 bulb: 21/8 = 2-5/8″ diameter.
- A25 bulb: 25/8 = 3-1/8″ diameter.
- G11 bulb: 11/8 = 1-3/8″ diameter.
- G14 bulb: 14/8 = 1-3/4″ diameter.
- G16/G50: 16/8 = 2″ diameter.
What are the methods of lighting?
Direct Lighting. In a direct lighting system, 90 to 100 percent of the light from the luminaire shines toward the work surface.
What is Type G light bulb?
Globe (G) bulbs have a full, round shape and are available in various sizes. They can be used for many applications throughout the home, such as foyer lights, kitchen lights, chandeliers, and ornamental fixtures. The most common type is the large G30 bulb, which is used in bathroom and makeup vanities.
What is the difference between E12 and B10?
B10 refers to bulb shape and means “blunt tip”. They can be medium base (E26) or candelabra (E12). E12 means American style candelabra base.
What do the letters and numbers on light bulb packages mean?
The letters and numbers on light bulb packages are coded shorthand for the shape and size of each bulb. In other words, they precisely describe the shape or type of bulb as well as its diameter.
Why is the light bulb called a light bulb?
This is where the name “light bulb” comes from. Over time, the phrase “light bulb” has become used, in general, to describe any source of light that is powered by electricity. In its root meaning, though, this is what it is: an object shaped like a flower bulb which produces light.
What does the letter B stand for in a light bulb?
B can indicate one of three different shapes. When it is used by itself, though, it stands for bullet. A bullet light bulb is a cylinder with a rounded end, like a tubular incandescent bulb, but with a base that is smaller than the glass cylinder. A BR bulb is a bulged reflector bulb.
What is an explanation letter and how to write one?
Explanation letters are usually written for explaining the mistake, an incident or to explain the reason of absence or negligence.