# How do you read light bulb numbers?

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## What does G45 bulb mean?

The number in the code refers to the bulb’s diameter in one-eighth of an inch or a millimeter. G45 bulbs are small and compact. They are considerably smaller than A19 bulbs. … They are quite similar to candle bulbs, and they are commonly found in bedside lamps and desk lamps as they take up little space.

## 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.

## How do you read a lamp code?

Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to …

## How do you figure out what bulb I need?

2. Determine much light you need

1. If you used to buy 100 watt bulbs, look for a bulb with 1600 lumens.
2. If you used to buy 75 watt bulbs, look for a bulb with 1100 lumens.
3. If you used to buy 60 watt bulbs, look for a bulb with 800 lumens.
4. If you used to buy 40 watt bulbs, look for a bulb with 450 lumens.
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## What happens if you put a T8 bulb in a T12 fixture?

you have to remove the ballast- as most t8 tubes have an electronic one inside. If you put them in t12- you will burn the bulb up and they will work sporadically before they die. Also the fixture gets blackend.

## Can you use T8 fluorescent bulbs in a T12 fixture?

T8 tubes are simply 1 inch in diameter versus the 1.5 inch diameter of T12 tubes. In an effort to make LED tube lights compatible with the internal dimensions of most fixtures, you will find that most LED tube lights feature a T8 or 1 inch diameter. They can indeed be used in T12 fixtures.