What does the term A19 mean?
The general form and measurements of a light bulb are referred to as A19. The word has been in use since the advent of incandescent bulbs, and it is still used today in reference to CFL and LED bulbs.
The initial letter and the two-digit number make up the name A19.
The letter "A" stands for the bulb's general form. The traditional light bulb form of a "A" bulb is sometimes compared to that of an upside-down pear.
The two numbers after the letter correspond to the bulb's diameter at its widest point, and is measured in eighths of an inch. Hence, the diameter of an A19 bulb is 19 divided by 8 inches, or around 2.4 inches. (Alternatively, this may be computed as 19 times a quarter-inch).
An A19 bulb's dimensions
An A19 bulb is, by definition, around 2.4 inches in diameter. A19 bulbs can also be referred to as A60 in nations that utilise the metric system, where 60 denotes the diameter in millimetres.
The length of an A19 bulb is typically 3.9 - 4.3 inches (100-110 mm) in length.
The ANSI C79.1 standards in North America provide the parameters for an A19 bulb's standard dimensions. Several maximum bulb size parameters are specified for various bulb wattages:
40W Type 210:
108 mm max length, 69.0 mm max diameter
40W Type 211:
112.7 mm max length, 69.5 mm max diameter
50W Type 206:
100 mm max length, 68.0 mm max diameter
50W Type 211:
112.7 mm max length, 69.5 mm max diameter
60W:
112.7 mm max length, 69.5 mm max diameter
75W:
112.7 mm max length, 69.5 mm max diameter
100W:
112.7 mm max length, 69.5 mm max diameter
Generally speaking, an A19 bulb is deemed to be within specifications if its length and diameter are both no more than 112.7 mm and 69.5 mm, respectively.
Always use E26 bulbs instead of A19 bulbs.
According to ANSI specifications, A19 bulbs must always be mounted into a light fixture using an E26 base.
A19 and E26 relate to various things, however in this case, you will find that all A19 bulbs use E26 lamp bases.
The contrary, however, is not always true: not all E26 bulbs will have an A19 form. Some E26 bulbs have entirely different forms from a typical A19 or A-style bulb.
A19 LED and CFL lights are what?
Incandescent lights are now being replaced with CFL and LED bulbs, which were developed as energy-efficient lighting alternatives. To guarantee that they can be used as true retrofit replacements in A19 fixtures, however, CFL and LED bulbs that have taken the place of incandescent lights and employ the A19 form factor have continued to use this design.
If you have a fixture or table lamp made for A19 lamps, keep looking for A19 LED bulbs while looking for LED lights.
How Bright Should an A19 Light Be in Lumens or Watts?
The majority of A19 LED bulbs will list their incandescent wattage equivalents. As an illustration, the incandescent equivalent wattage of a 10W A19 LED light can be listed as "60W equivalent" to indicate that it will be just as bright as a 60W incandescent lamp.
Using metric lumens is the standard unit of measurement for brightness. A 60W incandescent bulb produces 800 lumens, compared to 450 for a 40W incandescent light. These corresponding lumen values serve as the foundation for the industry-standard wattage equivalent computations.
To quickly determine if a new A19 lamp will provide adequate light, compare the wattage equivalent figures, or for a more precise comparison, the lumen output value.
If you don't already have any incandescent bulbs, you might want to use our lumen estimation tool.
What Color Temperature (CCT) of A19 Bulb Should I Pick?
LED bulbs, as opposed to conventional A19 incandescent lamps, may emit a range of colours. Go for a 2700K colour temperature (CCT) rating if all you want is the same, warm glow of an incandescent A19 bulb.
Nevertheless, if you want something that looks more like natural daylight or is a little sharper, you should think about something that is 4000K or above.
Check out our colour temperature infographic flowchart for more advice on choosing a colour temperature!
For solutions that properly mimic the brightness of an incandescent bulb, take high CRI options into account. A low CRI LED light source won't display colours as accurately as an incandescent one. For the majority of residential applications, we advise CRI values over 90, with 95 or higher being desirable.
How is the light distributed when an A19 bulb is used?
A19 bulbs have no built-in reflectors, therefore they emit light from a 360-degree angle. An incandescent bulb's filament evenly and continuously emits light in all directions.
Some A19 LED bulbs perform this better than others, however most A19 LED lamps output light in a wide angle to replicate the same light distribution as an incandescent light. A19 LED filament bulbs have been produced in order to provide a light distribution that is as close to an incandescent filament as possible. These bulbs use far more effective LED filament technology, yet they nonetheless generate light in a manner similar to that of a conventional filament.
Are A19 and A60 bulbs interchangeable? They're interchangeable, right?
Bulb designations in nations that utilise the metric system will be A60 rather than A19. This is due to the fact that the number 60 stands for millimetres, which are roughly the same size as 19 eighths of an inch.
While they are equivalent in terms of dimensions, their screw bases probably differ.
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