Welcome guest, click here to login
cart is empty
cart | checkout
Questions? call toll free 877-252-3598
International: 1.760.230.8045
facebook
twitter
dont miss a deal

Light Bulb Shapes and Sizes - LED Light University by EagleLight

EagleLight's LED University: Light Bulb Shapes & Sizes Explained

B/bulbshapes

Naming Conventions for Light Bulb Shapes


Lighting lamps and light bulbs are described by a shape and diameter and length designation. This normally is in the form of letter(s) followed by a number followed by an optional letter. The first letter(s) indicate the shape, the numbers indicate the diameter and the final, optional letter can designate the length.
Lightbulb shape examples include: PAR for Parabolic Aluminum Reflector light bulb or T for Tube. Many household halogen light bulbs are a MR16 for Metallic Reflective.
Click on the image to enlarge
Sizes are referenced by a number that follows the shape. In the US these numbers indicate the maximum diameter in eighths of an inch. In other parts of the world this number will designate the diameter in millimeters. An example of a US bulb is the R20, this is 20/8 or 2.5" in diameter. An example of a metric measure is the A19 which is the typical household incandescent light.

Sample LED Light Bulb Shape Designations:

  • A Standard household incandescent light bulb shape
  • B Bulged bulb shape
  • BT Bulged or Blown Tubular bulb shape
  • BR Short reflector style light bulb
  • C Candle or Conical bulb shape
  • CP Crystalline Pear bulb shape
  • E Ellipsoidal bulb shape
  • ER Extended reflector light bulb shape
  • F Flame style candelabra bulb shape
  • G Globe bulb or circular bulb
  • HK Hexagonal Candle
  • K Krypton or narrow reflector light bulb shape
  • MB Halogen bulb
  • MR Quartz reflector lamp (low wattage)
  • P Pear bulb shape
  • PAR Parabolic Aluminized Reflector (PAR) lamp
  • PS Elongated standard incandescent bulb
  • R Reflector light bulb style
  • S Strait Sided bulb style
  • T Tube lamp shape

Here are some standard diameter sizes:

  • 8 = 1 inch Example: T8
  • 11 = 1.375 inches Example: MR11
  • 16 = 2 inches Example: MR16
  • 20 = 2.5 inches Example: R20
  • 30 = 3.75 inches Example: PAR30
  • 38 = 4.75 inches Example: PAR38

Length designations include:

  • S for short
  • L for long
bulb_types/bulbshapes_series_a

A Shaped Light Bulbs


"A" type bulb shapes are standard house hold light bulbs. The number after the bulb shape is the number of eighths of and inch in diameter. For non-imperial measured bulbs the number following the bulb shape is the number of centimeters at the widest point of the bulb.
Standard bulb sizes include A19 for imperial measurements and A60 for a slightly smaller metric measured bulb.
bulb_types/bulbshapes_series_b

B and C Shaped Light Bulbs


B shaped bulbs are also know as Candelabra Light Bulbs. The have a bulged base that tapers to a rounded or pointed tip. In some bulbs the tip is bent giving the slight look of a licking flame. C shaped bulbs are similar to holiday lamps.
These bulbs are common in chandeliers, night lights and lower wattage applications such as holiday string lights.
Typical bases for B and C shaped bulbs are E12 in North America.
bulb_types/bulbshapes_series_par

PAR Light Bulbs: PAR16, PAR20, PAR30 and PAR38


PAR light bulbs utilize a parabolic mirror or reflective surface to focus the light. For LEDs the PAR designation is used to define the shape, as most do not have a reflective lower surface due to the directive nature of LEDs.
Common PAR lamps include the PAR20, PAR30, PAR38 and PAR42, though many other sizes exist. These bulbs come in various beam angles that result in spot and flood lamps.
This shape is very similar to the R shape and in some cases the PAR and R are interchangeable as shapes for LED replacements.
PAR Size Diameter in Inches
PAR-16 2
PAR-20 2 1/2
PAR-20 2 1/2
PAR-30 3 3/4
PAR-36 4 1/2
PAR-38 4 3/4
PAR-46 5 3/4
PAR-56 7
PAR-64 8
5W LED Light Bulb - 44 LEDs (replaces up to 50W)
5W LED Light Bulb - 44 LEDs (replaces up to 50W)
Retail Price: $59.00
Our Price: $16.99
You Save: $42.01
LED Warm White Candelabra 2W Chandelier/Night Light replacement
LED Warm White Candelabra 2W Chandelier/Night Light replacement
Retail Price: $39.99
Our Price: $26.95
You Save: $13.04
4W 27SMD LED Chandelier E12 Candelabra Base
4W 27SMD LED Chandelier E12 Candelabra Base
Retail Price: $35.99
Our Price: $26.99
You Save: $9.00
Color Changing LED Globe Light Bulb and Remote (Standard screw-in E27 base)
Color Changing LED Globe Light Bulb and Remote (Standard screw-in E27 base)
Retail Price: $52.99
Our Price: $35.99
You Save: $17.00
Dimmable PAR30 LED Flood Light 9W (replaces up to 75W)
  Dimmable PAR30 LED Flood Light 9W (replaces up to 75W)
Retail Price: $98.99
Our Price: $57.99
You Save: $41.00
2 Watt LED MR11 w 10 SMD LED's (Replaces up to 20W)
2 Watt LED MR11 w 10 SMD LED's (Replaces up to 20W)
Retail Price: $29.99
Our Price: $17.99
You Save: $12.00
21SMT LED R20: GU10 base- (Replaces up to a 35W)
21SMT LED R20: GU10 base- (Replaces up to a 35W)
Retail Price: $29.99
Our Price: $21.99
You Save: $8.00
8W LED Dimmable LED House Hold Bulb (Replaces up to 60W)
8W LED Dimmable LED House Hold Bulb (Replaces up to 60W)
Retail Price: $60.00
Our Price: $45.99
You Save: $14.01
Copyright © 2014. Please read our Privacy Statement.


home contact faq shop specials Information About

Eagle Light BBB Business Review
Payment Processing

we ship FedEx we ship USPS we ship ups