What do the letters and numbers mean on light bulbs?

What do lightbulb numbers mean?

The numbers that follow the letter codes are the codes for the size of the light bulb. They show the diameter of the bulb, or lamp, in eights of an inch. … A common A-19 light bulb is 2-3/8 inches in diameter, and an R-30 flood light is 3-3/4 inches across its widest part.

What does T8 or T12 mean?

A T12 lamp (on the left in the figure below) is therefore twelve-eighths of an inch, or one-and-one-half inches (3.81 cm), in diameter. A T8 lamp (on the right in the figure below) is eight-eighths of an inch, or one inch (2.54 cm), in diameter.

Can I use A21 bulb instead of A19?

Are A19 lamps compatible in A21 lampholders? Yes, because A19 lamps are smaller in all dimensions than A21 lamps, they will fit in virtually all fixtures and lampholders designed for A21 lamps. Since they utilize the same E26 base, the A19 lamps will fit into the socket just fine.

What does V mean in light bulbs?

Voltage. Typically, the voltage of your lamp should match the voltage in your electrical lines.

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How do I know what kind of lightbulb I need?

If you used to buy 100 watt bulbs, look for a bulb with 1600 lumens. If you used to buy 75 watt bulbs, look for a bulb with 1100 lumens. If you used to buy 60 watt bulbs, look for a bulb with 800 lumens. If you used to buy 40 watt bulbs, look for a bulb with 450 lumens.

What happens if you put a T8 bulb in a T12 fixture?

T8 LED tubes won’t fall out if you try to install them in a T12 fixture—they’ll fit just fine. … This is because T12 fixtures have non-shunted tombstones, exactly what you need for LED tubes. T8 fixtures have shunted tombstones, and those tombstones need to be replaced as part of the conversion to LED.

What does G13 mean in lighting?

You can recognize a T8 tube from it’s 28mm diameter. The socket is called G13 this because the 2 pins are 13mm apart from each other. . A T8 tube can work on an electronical ballast using a fixture without a starter. As with a conventional ballast, a fixture with a starter.

How do I know if I need a T8 or T12 bulb?

Replace Current Lamp

You will see either T8 or T12 stamped on one side near the end with the prongs. You also will see the lamp’s rated wattage, usually 32 watts for T8 and 40 watts for T12. … T12 lamps are larger than T8 lamps, with a 1 ½-inch diameter. The diameter of a T8 lamp is 1 inch.

What does FMW mean in lighting?

FMW. Energy Used. Energy Used. A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.

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What does NFL mean on a light bulb?

Narrow Flood (NFL)

At 23 to 32 degrees for an MR16 or 61 to 90 degrees for a PAR lamp, this reflector casts a medium-wide beam.

What does DL mean in lighting?

LED Retrofit Downlights

LED downlights are also referred to as can lights, pot lights and recessed lights. The LED recessed light fixtures available at NASG LED deliver significant savings when compared to standard incandescent bulbs.