Light Bulbs of Different Bases Used in the United States

Light bulbs come in many different bases and types, and they are different from country to country. Here we focus on the bases used most frequently in the United States. Most household light fixtures use light bulbs of candlelabra bases, intermediate bases, and/or medium bases.

The candlebra bases used most commonly in the United States are E10, E11, and E12, which are also used in Canada and Japan. The intermediate base E17 is used in the United State and Japan. E26 and E27 are medium bases and are used in the United States, Canada, Europe, and Japan. The tw0-digit number following the letter E indicates the diameter (in millimeters) of the cap of the light bulb. For example, an E26 light bulb indicates that the cap of the light bulb has a diameter of 26 millimeters.


Picture from this website

Since light bulbs come in different bases, it is important to know which base of the light bulb your light fixture houses before you rush to get any light bulb replacements. Nowadays, LED light bulbs are designed to fit the existing light fixtures. Replacing your money-wasting traditional light bulbs or environmentally unfriendly CFLs with the green, high-tech, energy-saving LED light bulbs is as easy as 1-2-3. Best of all, you save yourself tons of money and be a good global citizen saving the planet. That is a very sweet deal, I’d say.

Pictures from Smith Symposium at Penn State York

Here are a few pictures taken from the Smith Symposium at Penn State York on Nov. 10, 2012. My undergraduate research assistants, Richard George and Austin Crain, attended the symposium. Richard gave a presentation on our numerical simulation results of gravity-wave induced airglow variation in the OH, O2B1, and O1S emission in the Mesosphere and Lower Thermosphere (MLT) region. Richard did a great job in presenting the material. Austin won a mug from raffle drawing. Further info on the presenters from the Lehigh Valley campus can be found through the link: Two students present at Smith Symposium

Austin, myself, and Dr. Jackie McLaughlin went with Dr. Roger Egolf and Richard arrived from University Park. The ride was very pleasant but a bit exhaustive for me on our way home since I was engaged in intellectual discussion with Austin for almost 2+2 hrs ;-).