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Light Bulb Shape Guide: AR-Shape

Light Bulb Shape Guide: AR-Shape

The AR shaped light bulb is known for its ability to tightly control its beam spread for specialty applications that require high levels of accent lighting. Initially introduced as a halogen bulb, they are now commonly found as energy efficient LED alternatives. Previously we discussed the PAR shaped bulb but, for this installment of the Light Bulb Shape Guide we will be covering the AR shaped bulb.

AR Light Bulb Shapes

Similar to our previously mentioned light bulbs, this lights shape is identified by its code. The shape code is comprised of the acronym, AR which stands for “Aluminum-facetted Reflector,” followed by a numerical value which indicates the diameter of the widest part of the bulb, measured in millimeters. Depending on the light fixture, base, and wattage rating, the AR111 shape is the competitive cousin to the PAR36, as they are nearly interchangeable. The following chart lists the most common AR shaped bulbs and their respective diameters.

Shape Diameter in Millimeters
AR11 11
AR70 70
AR111 111

As mentioned above, the AR shaped bulb is typically used for applications that wish to accentuate a space or object. With an aluminized reflector built into the design, the bulb offers a precise beam angle. Depending on the design of the AR bulb, the beam angle may be as concentrated as 4-degrees or as full as 45-degrees. 

AR Light Bulb Base Types

Depending on your geographical location, the AR shaped bulbs may be less commonly used since a majority of light fixtures feature a medium E26 base (house hold bulb socket) yet, there is no rule of thumb on which particular base is superior. If you’re unsure which base type your light fixture requires, it is best practice to verify the type of base you have before purchasing a replacement bulb. The following chart below lists some of the most common types of bases in correlation with the AR bulb. 

Code Type
DC Bayonet (BA15D) Push-in
G53 Push-in or Push-screw
GU10 Twist-and-lock

Where are AR Light Bulbs Used?

The majority of AR bulbs in use today are for low voltage applications that range from 12-Volts to 24-Volts but may also be available in a house hold 120-Volts. With a precise directional beam spread, these types of bulbs are mainly used for retail displays, architectural lighting, or even atrium lighting. Combining the right Kelvin temperatures and lumen outputs, you can create dramatic effects to accent statues or works of art by installing a trusty AR bulb.

Do you now know what bulb you “AR” looking for? Watt were you expecting, we can’t help ourselves. All puns aside, check back on our blog for weekly lighting updates and intriguing factoids! Feel free to leave your thoughts, questions, or concerns on how cheesy our jokes are, in the comment section below. Stay in the loop through 1000Bulbs social media channels via, Facebook, Twitter, Google+, LinkedIn, and Pinterest.

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