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What do the numbers and letters mean on a light bulb?

What do the numbers and letters mean on a light bulb?

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.

How do you read light bulb numbers?

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

  1. A15 bulb: 15/8 = 1-7/8″ diameter.
  2. A19 bulb: 19/8 = 2-3/8″ diameter.
  3. A21 bulb: 21/8 = 2-5/8″ diameter.
  4. A25 bulb: 25/8 = 3-1/8″ diameter.
  5. G11 bulb: 11/8 = 1-3/8″ diameter.
  6. G14 bulb: 14/8 = 1-3/4″ diameter.
  7. G16/G50: 16/8 = 2″ diameter.

What does Type S light bulb mean?

Type S doesn’t refer to the mount; rather, it indicates the shape. Type S light bulbs are shorter, rounder-shaped bulbs and can use the same mount as a Type A or Type B light bulb.

What is the code for a standard light bulb?

There are four commonly used thread size groups for lamps: Candelabra: E12 North America, E11 in Europe. Intermediate: E17 North America, E14 (Small ES, SES) in Europe. Medium or standard: E26 (MES) in North America, E27 (ES) in Europe.

How do I know what kind of lightbulb I need?

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 do you tell what wattage a bulb is?

Find the Wattage Rating of a Light Bulb All light bulbs, whether they are traditional incandescent bulbs, fluorescent bulbs (CFUs), or LED (light-emitting diode) bulbs will have a wattage rating printed somewhere on the glass or on the metal collar of the bulb.

Can I use A21 bulb instead of A19?

Are A19 lamps compatible in A21 lampholders? Yes, because A19 lamps are smaller in all dimensions than A21 lamps, they will fit in virtually all fixtures and lampholders designed for A21 lamps. Since they utilize the same E26 base, the A19 lamps will fit into the socket just fine.

What size is R50 light bulb?

Most commonly used R/BR series bulbs size chart
Light bulb
Light bulb code R50 R80
Diameter in millimetres 159mm 254mm
Diameter in one-eights of an inch 50/8 (6 1/4″) 80/8 (10″)

What does the BT code mean on a light bulb?

A BT code may indicate a bulged tube or chimney light bulb, but it can also stand for a blunt tip light bulb—the ones that are flame-shaped with a rounded end. On the other hand, to be totally confusing, BT light bulbs can also stand for bent tip, which is the exact opposite of a blunt tip.

What is the code for a globular light bulb?

of 08. G arsenik / Getty Images “G” is the code for a globular light bulb. These bulbs are often mounted in the open so they can be seen. One popular location for globular light bulbs is in a multi-socket light fixture above a vanity mirror.

What is the code for a circline light bulb?

CIR tells you it’s a circular or circline lamp. In other words, it’s a fluorescent tube made in a circle. G is the code for a globular light bulb. These bulbs are often mounted in the open so they can be seen. One popular location for globular light bulbs is in a multi-socket light fixture above a vanity mirror .

What do the numbers on a light bulb mean?

Numbers in a bulb code indicate size in millimeters or eighths of an inch. These codes will tell you if a bulb will fit in your fixture and if it’s the right shape.

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