What are bulb sizes?

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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. The bulb is "A" type and the diameter would be 23/8".

Similarly one may ask, what are the different sizes of light bulbs?

There are only three bulb sizes that we sell: C7, C9 and Medium. These are the names we use, but these bulb sizes can go by many different names.

Light Bulb & Socket Guide

  • C7 Bulbs have a candelabra or E12 base.
  • C9 Bulbs have an intermediate or E17 base.
  • Medium Bulbs have a E26 base (E27 in Europe).

Also, what is a Type C light bulb? C light bulbs are made to look like a candle flame for decorative applications, such as chandeliers, restaurants, bathrooms, and hotels. C light bulbs with a blunt tip are sometimes referred to as “torpedo shaped” or “bullet,” as with most compact fluorescent C light bulbs and C-7 incandescent bulbs.

In this way, how do I know Bulb size?

To determine a light bulb size, use the full size scale shown (calibrated in eighths). Place edge of the light bulb to be identified on the top end of the scale and measure the approximate diameter by reading the measurement at the opposite edge of the light bulb.

How do I know what light bulb I need?


  1. Look for the right wattage.
  2. Pay attention to the lumens.
  3. Look at the shape of the bulb.
  4. Check the 'life expectancy' of the light bulb.
  5. Make note of the 'light appearance' of the bulb.
  6. Look at the energy cost of the bulb.
  7. Check the mercury content of the light bulb.

23 Related Question Answers Found

How big is an a15 bulb?

The A15 bulb is 158 in (1 78 in; 48 mm) wide at its widest point.

What is a standard light bulb?

Incandescent Light Bulb Shapes
The number following A is the diameter of the bulb in eighths of an inch, meaning a typical A19 bulb is 2.375 (19/8) inches in diameter and an A21 bulb is 2.625 (21/8) inches in diameter. The smaller A15 bulbs are lower wattage and the A23 are higher wattage.

Does bulb shape matter?

The letter indicates the shape of the base, while the number indicates the size. Always check your lighting fixture before purchasing bulbs. These are the basics on light bulb bases. Sizes and shapes do matter – so be mindful before purchasing a new bulb.

What is a Type A 60 watt bulb?

Common 60 watt incandescent type A light bulbs are being phased out in favor of more efficient halogen, CFL and LED equivalent bulbs. Until inventories are gone, 60 watt incandescent bulbs can still be sold. Some of the 60 watt bulbs shown below may have a slightly different diameter 1.9" dia.

What are the 3 types of light bulbs?

There are three basic kinds of light bulbs on the market: incandescent, halogen, and CFL (compact fluorescent light).

How do you buy a light bulb?

If you used to buy 100 watt bulbs, look for a bulb with 1600 lumens. If you used to buy 75 watt bulbs, look for a bulb with 1100 lumens. If you used to buy 60 watt bulbs, look for a bulb with 800 lumens. If you used to buy 40 watt bulbs, look for a bulb with 450 lumens.

How many watt light bulb do I need?

As long as you don't put a bulb that uses more than 60 watts in that socket you will be fine. The good news is the energy-saving bulbs that replace a 60-watt incandescent will only use 10 to 15 watts, depending on the actual bulb you buy, and give off the same amount of light.

What sizes do LED light bulbs come in?

LED globes have a spherical design that is easy to recognize. These bulbs range in size from a 1.5-inch diameter up to a 5-inch diameter. Aside from vanity lights, LED globes are commonly used in wall sconces, light stringers, and other decorative fixtures.

What is Type G light bulb?

G type miniature bulbs are found in many applications including: auto indicator and instrument, aircraft and marine. The number after the 'G' is the diameter of the glass in 1/8 inch increments. A G5 bulb, for example, has a diameter of 5/8 of an inch.

What are the 4 types of light bulbs?

Here is the list of five most common types of Light Bulbs along with their respective advantages.
  • Incandescent Bulbs: Incandescent bulbs are the typical bulbs.
  • Fluorescent Lamps:
  • Compact Fluorescent Lamps (CFL):
  • Halogen Lamps:
  • Light Emitting Diode (LED):

What are the different types of lights?

Different Types of Lights or Lamps in a Lighting system
  • Incandescent lamps.
  • Compact fluorescent lamps.
  • Halogen lamps.
  • Metal halide Lamps.
  • Light Emitting Diode.
  • Fluorescent tube.
  • Neon lamps.
  • High intensity discharge lamps.

What does s11 bulb mean?

The Philips 40-Watt S11 High-Intensity Light Bulb features an S11 shape and an intermediate base for indoor commercial and residential use. This high-intensity light bulb uses 40-Watt and is rated for 500-hours of use. This Philips bulb is Ideal for indoor, residential use. Brightness: 440-Lumens.

Do LED bulbs get hot?

You probably know that LED bulbs run dramatically cooler than their incandescent cousins, but that doesn't mean they don't produce heat. LED bulbs do get hot, but the heat is pulled away by a heat sink in the base of the bulb.

What does Type A mean on a light bulb?

Bulb Shape
A type describes a bulb that has a pear-like shape. The number that follows the "A" within the A series indicates the width of the bulb in one-eighth inch units or in millimeters.

What does t4 mean in halogen bulbs?

Q: what does "t4" mean? Answer this question. Cancel Answer. A: The "T" in T3 or T4 type halogen bulbs refers to the tubular shape, (not base) while the number refers to the diameter of the bulb. So, "T" is for Tubular, (but they can also be referred to as the 'peanut bu… see more.

Are Type B and C bulbs interchangeable?

Conical (C) bulbs are shaped like a cone. Blunt-tip (B) bulbs are very similar to C-type bulbs but have more of a torpedo or bullet shape. These bulbs can be used in chandeliers, wall sconces, pendant lights, night lights, decorative light strands, holiday light strands, and other decorative home lighting applications.

What is the difference between g16 and g16 5 bulbs?

The 16.5 tell you how many eighths of an inch in diameter the glass part is of the bulb. So a G16. 5 lamp would be a round lamp that is 2-1/16" in diameter (16.5 x 1/8). The 16.5 tell you how many eighths of an inch in diameter the glass part is of the bulb.