Type of Lighting Bulbs (Shapes and Sizes) Part-2


(6) S (Straight Side) Type Bulb (Code: S)

  • “S” means Straight Side.
  • Nomenclature:
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • S20 bulb: 20/8 = 2-1/2″ diameter
  • Lighting direction: Uni direction.
  • Bulb Technology: incandescent , LED,  tungsten-halogen, CFL

  • Application:
  • S type miniature light bulbs are found in many applications including: indicator, auto stop and turn signal lights, scientific and medical instruments, microscopes and aircraft.

(7) T (Tubular) Type Bulb (Code: T)

  • T means “Tubular”.
  • It is known as “T” type because it has a shape of cylindrical Tube.
  • (T )Tubular type light bulb is available in wide bulb technology like Incandescent, Linear fluorescent, HID and LED.
  • T light bulbs have very different applications according to its shape.
  • Incandescent T6 light bulbs are used in exit and stairway signs and picture lights.
  • Linear fluorescent T12, T10, T8, and T5 light bulbs come in a variety of lengths, ranging from 2 to 8 feet. These light bulbs are used for general lighting in offices, retail outlets, hospitals, and parking garages.
  • High intensity discharge light bulbs also come in T shapes, including T9 and T15. These light bulbs are used in sports arenas, billboard signage, and industrial applications.
  • Tube Type bulbs are available in different shape like
  • Linear Tube Light Shape:
  • T12, T8 and T5 are naming convention for tube lights where “12” is the thickest and “5” is the slimmest tube light. 
  • U-Bend :
  • U-Bend Tube light bulbs T8 is created by bending a 4-foot length T light bulb into a U shape in order to reduce the maximum overall length of the light bulb. This is desirable in some locations that have limited space. By bending a 4-foot light bulb into a U configuration that is comparable to a 2 foot light bulb in length, the end user will receive double the light output in the smaller space. This light bulb is used in offices, hospitals, and retail applications.
  • Spiral Shape:
  • The spiral light bulb is the shape of a compact fluorescent light bulb. A smaller diameter fluorescent T light bulb, such as T4, T3, T2, or T1, is twisted into a spiral or coil configuration in order to provide the most amount of light output in the least amount of space.
  • Spiral light bulbs are typically used to replace incandescent light bulbs and can be used virtually anywhere, including residential, commercial, retail, hospitality, and restaurant applications.
  • Nomenclature: T4, T8.
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • T8 bulb: 8/8 = 1″ diameter
  • Lighting direction: illuminates its light in Omni direction.
  • Bulb Technology: Incandescent, CFL, High Intension Discharge Lamps, Metal Halide Lamp, Sodium Discharge, Mercury Vapor Lamp and LED.

  • Applications:
  • Depending on their size, these bulbs can be used in applications ranging from chandeliers, wall sconces, and pendant lights to basement and garage light fixtures.
  • Exhibition hall, showing and advertising board
  • Industry plant, workshop, warehouse
  • Sports lighting, stadium, gymnasium and car parking area
  • Flood lighting for tunnel, port, viaduct, Public Square and construction site etc.

(8) Double Ended Type Bulb (Code: T3)

  • It is “T” Type cylindrical Tube Blub having a both end connection.
  • Double ended Bulb (T3) is installed in horizontal position.
  • These light bulbs are a cost-effective alternative to standard light bulbs and a completely dimmable in multiple lighting applications
  • Nomenclature:
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • T3 bulb: 3/8 = 0.3″ diameter
  • Lighting direction: illuminates in Omni direction.
  • Bulb Technology: Incandescent, Metal Halide, halogen, LED.

 

  • Application:
  • Mostly used in commercial lighting, ambient lighting and flood lighting.
  • It can be horizontally installed. With a compact size it provides a uniform lighting for a large area.

 (9) PS (Pear shape) Type Bulbs (Code: PS)

  • PS means “Pear shape”.
  • Pear shape light bulbs are similar to A Type light bulbs, except they have a larger diameter, which causes the bulb to look like a pear.
  • Nomenclature: PS30,PS40.
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • PS15 bulb: 15/8 = 1-7/8″ diameter
  • Lighting direction: illuminates its light in Omni direction.
  • Bulb Technology: incandescent, LED, CFL.

  • Application:
  • Office buildings and retail stores, Radio towers, cellular towers, bridge power lines, and high tension wires.

(10) S (Sign) Type Bulbs (Code: S)

  • S means “Sign light”.
  • Sign light bulbs also known as the “original light bulb” of the incandescent.
  • Sign Bulbs also used in low-wattage lights.
  • Sign Bulbs come in clear, frosted and colored options.
  • Sign Bulbs available in transparent amber, blue, green, pink, red and yellow.
  • Nomenclature: S30, S40.
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • S15 bulb: 15/8 = 1-7/8″ diameter
  • Lighting direction: illuminates its light in Omni direction.
  • Bulb Technology: incandescent, LED, CFL.

  • Application:
  • Ideal for multiple residential and commercial uses with incandescent lamps features excellent light output and good optic control along with dimming capabilities.
  • Sign light bulbs are found in outdoor signs used by casinos, hotels, restaurants, and theatres.
  • Sign lamps can be as simple as a way to promote your business by eye-catching company Signage installations.

Type of Lighting Bulbs (Shapes and Sizes) Part-1


Introduction:

  • There are various Shapes of bulbs available in market. Some lamp shape is widely used on other hand some lamp shape is used in special requirements.
  • If we properly understand bulb codes, it’s easy to select appropriate bulb for a light fixture.
  • Bulbs shapes are mostly classified according to direction of lights, lighting glare and Bulb size.
  • Every light bulb has identifying characteristics that are represented by a letter or series of letters and a number, these are known as light bulb codes.

Types of Lamps in a Lighting system

  • There are following types of lamps which are available in different shapes.
  • Incandescent lamps
  • Fluorescent tube
  • Compact fluorescent lamps (CFL)
  • Halogen lamps
  • Light Emitting Diode (LED)
  • Neon lamps
  • High intensity discharge lamps
  1. Metal Halide.
  2. High-Pressure Sodium
  3. Low-Pressure Sodium
  4. Mercury Vapor

Nomenclature of Bulb:

  • The Bulb Code is indicating as a Letter-Number-Letterformat, the last letter is optional.
  • The First Letter in a bulb code indicates either shape or special features such as reflector type.
  • The Second Letter (Number) in a bulb code indicates size of Bulb in millimeters or eighths of an inch .It will tell us whether the bulb will fit in fixture or not.
  • The Third Letter is optional which indicate Bulb length.
  • Example: BR30S
  • First Letter: BR=” Bulged Reflector”
  • Second Letter = diameter of Light Bulb =30/8 inches, or 3 and 3/4 inches.
  • We can say that PAR30, R30 and BR30 all have same size bulb.
  • Knowing the diameter and sizes of these light bulbs is important because in some unique cases the R and PAR are interchangeable as LED bulb replacements.
  • If in Code there is “S” or an “L” indication in last, that stands for either short neck or long neck.

Shapes of Lighting Bulbs:

  • There are following Shapes of Lamps, Some are very common in everyday uses while some are use in special requirements.
  • According to Shape:
  1. A (Arbitrary) Type Bulb (Code: A)
  2. B (Blunt Tip) Type Bulb (Code : C )
  3. C (Candle / Flame Tip ) Type Bulb (Code : C , CA)
  4. F (Flame Tip ) Type Bulb (Code : F)
  5. G (Globe) Type Bulb (Code: G)
  6. S (Straight Side) Type Bulb (Code: S)
  7. T (Tubes) Type Bulb: (Code : T,T3)
  8. Double Ended Type Bulb (Code:T3)
  9. Pear Shape Type Bulb (Code: PS)
  10. Sign Type Bulb (Code : S)
  11. H (Chimney ) Type Bulb (Code: H)
  • According to Reflector:
  1. R (Reflector) Type Bulb (Code : R)
  2. BR (Bulged Reflector) Type Bulb (Code : BR)
  3. MR (Mirror Reflector) Type Bulb (Code : MR)
  4. PAR (Parabolic Aluminized Reflector) Type Bulb (Code : PAR)
  • According to HID:
  1. E (Elliptical) Type Bulb (Code : E)
  2. ED (Elliptical Dimple) Type Bulb (Code : ED)
  3. ER (Elliptical Reflector) Type Bulb (Code : ER)
  4. BT (Blown or Bulbous Tube) Type Bulb (Code : ET)
  • According to Application:
  1. Flood Light (Code: E)
  2. Panel Light (Code: Panel Light)
  3. Strip Light
  4. Down Light (Code: GU)
  5. Recess Down Light (Code: Down light)
  6. Spot Light
  7. Corn Type Bulb
  8. Flat Tube
  9. High Bay
  10. RGB Light
  11. Street Light

Lighting Bulb according to Shape:

(1) A (Arbitrary) Type Bulb (Code: A):

  • A Means “Arbitrary”. It shape looks like ordinary Light Bulb.
  • It is also known as “Classic Globe Type” or “Standard shape Type” Bulb.
  • Thislamp is the most commonly used as household lamp.
  • It is normally used in fixtures where the bulb is visible.
  • It is not known that why it known as A Type. It doesn’t look like an A Shape until we turn it down.
  • We can assume that this is the first type of light bulb introduce in market hence it called “A” Type.
  • Nomenclature: A35, A20.
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • A15 bulb: 15/8 = 1-7/8″ diameter
  • Lighting direction: Omni direction.
  • Bulb Technology: incandescent, LED, CFL.

  • Application:
  • Standard / arbitrary (A) bulbs are normally widely used in Household lighting.
  • These bulbs work well for a variety of applications, such as ceiling lights, lamps, vanity lights, kitchen lights, closet lights, porch light fixtures, Room lighting, Reading lamps, Ceiling Light, Wall Light and Hallways Light. It also used in some chandeliers.

(2) B (Blunt Tip) Type Bulb (Code: B):

  • “B” means Blunt-tip.
  • This is a slimmer version of the Type A Bulb.
  • The bulb is generally in narrow and bullet shape.
  • B bulbs are very similar to C-type bulbs but they have a bulged base that tapers to a pointed tip hence look like a torpedo or bullet shape.
  • It is available in Clear or Frosted(opal)
  • Nomenclature:
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • B10 bulb: 10/8 = 1-1/4″ diameter
  • Lighting direction: Omni direction.
  • Bulb Technology: incandescent, LED, Tungsten-halogen, CFL.

  • Application:
  • This is most often used for decorative purposes and chandeliers, wall sconces, pendant lights.
  • It is also used in low wattage applications as a home lighting applications and night lights.

(3) C (Candle / Flame Tip) Type Bulb (Code: C, CA):

  • “C” means Conical or Candle and “CA” means Conical Angular.
  • CA bulbs are shaped like a cone but have a bent tip.
  • The shape of this Bulb is look like as a candle flame and referred to as candle bulbs.
  • Candelabra Light Bulbs are similar as B Shaped bulbs but bulb’s tip is bent giving the slight look of a flicking flame.
  • It is available in Clear or Frosted(opal)
  • Nomenclature:
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • C7 bulb: 7/8 = 7/8″ diameter
  • Lighting direction: Omni direction.
  • Bulb Technology: incandescent , LED,  Tungsten-halogen , CFL

  • Application:
  • These bulbs are common in chandeliers and decorative light strands, holiday light strands, pendant lights, and night lights.
  • We choose a blunt shape in more contemporary chandeliers if the bulb were seen.
  • It also use in low voltage application and as s night lights.

(4) F (Flame Tip) Type Bulb (Code: F):

  • “F” means “Flame” .
  • F light bulbs are similar in size and shape to C Type light bulbs.
  • However the glass of the bulb is blown or etched in such a way that causes the light to look as though it is flickering like a flame.
  • This bulb comes with a white finish, but to achieve candle-like appearance, a clear finish is preferred.
  • If the bulb is colored, a transparent color allows the filament to be visible.
  • It is available in clear or frosted(opal)
  • Nomenclature:
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • F10 bulb: 10/8 = 1-1/4″ diameter.
  • Lighting direction: Omni direction.
  • Bulb Technology: incandescent , LED,  Tungsten-halogen , CFL

  • Application:
  • F light bulbs are used in decorative applications such as chandeliers, bathrooms, and restaurants and commercial applications..

 (5) G (Globe) Type Bulb (Code: G)

  • G means “Globe.
  • Globe (G) bulbs have a full, round shape and are available in various sizes
  • It is available in candelabra or medium base.
  • Nomenclature: G15, G20.
  • Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.
  • G15 bulb: 15/8 = 1-7/8″ diameter.
  • Lighting direction: Omni direction.
  • Bulb Technology: incandescent , LED,  tungsten-halogen

  • Application:
  • Globe light bulbs are used in decorative applications in theatres, restaurants, and hotels
  • Globe light bulbs are used in a variety of applications where a decorative ball shaped light source is required such as ceiling fans, accent fixtures, kitchen lights, bathroom and makeup vanities, chandeliers, ornamental fixtures and table lamp, wall and floor lamps.
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