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.

About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

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

  1. Muhammad Mohsin Ansari says:

    Thanks….Parmar

  2. Mr. Narendra Singh says:

    You are giving wonderfull knowledge in electrical field, I am from commercial background but learn lot of things from your article.are you avaliable on utube it will be very usefull

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