A21 and e26 refer to different things but in this case you will find that all a21 bulbs use e26 lamp bases.
What does mogul base bulb mean.
And anything above 300 watts typically has a mogul base.
E39 bulbs are primarily used in north america while e40 bulbs are popular in europe.
Mogul base bulbs are made of cast porcelain to tolerate higher temperatures making them ideal for industrial and commercial uses e g power ratings of 250 1000 watts.
Be aware however that the opposite does not hold true.
An e26 bulb therefore is any bulb or lamp that utilizes the e26 cap or base for mounting and electrical contact.
Not all e26 bulbs will be of a21.
A21 bulbs always use e26 but not vice versa according to ansi standards a21 bulbs must always use an e26 base for mounting into a light fixture.
Most hid lamps have either a medium or mogul base.
A type describes a bulb that has a pear like shape.
E39 e40 mogul edison 39 mm or 40 mm diameter.
This base was developed by thomas edison for the first light bulbs and is still in use today.
Bulbs with these bases can be used interchangeably as there is only a 1 millimeter difference in base size.
Base types for hid lamps.
Some ceramic metal halides also come in a pin base.
Mogul bases are always assumed in the part number.
Shoppers of led light bulbs often confuse the specifications for base type e26 or e27 and bulb shape a19.
For example most of the time anything below 150 watts has a medium base.
The number that follows the a within the a series indicates the width of the bulb in one eighth inch units or in millimeters.
Now that we have learned that e26 and e27 are terms used to describe the type of base used what does a19 or bulbs with an a designation mean.
Find the light bulb base type you re looking for with this visual chart detailed illustrations of general bases fluorescent bases and specialty halogen base types.
You can most instantly recognize an e26 bulb by looking at the bottom or non light emitting side of the bulb.
Pick from led light bulbs high intensity discharge hid light bulbs and specialty light bulbs.
If you see a metallic base with screw threads approximately 1 inch in diameter you most likely have an e26 bulb.