Fluorescent Light Sizes Chart

Fluorescent tube sizes guide.

Fluorescent light sizes chart.

T4 t5 t8 and t12. Fluorescent light sizes shapes and base types. Most tube lighting will have its size mentioned on an end of the tube. 80 means a cri between 80 and 89 and so on.

There are 4 different fluorescent light options. 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 the nearest millimeter. In this code 70 means a cri between 70 and 79. The t stands for tubular and the numbers are an index for the diameter in inches of the tube.

Knowing how to find a fluorescent light bulb that fits all of your needs will save you time worry and ensure you get the right one every time. In the 1990s manufacturers began to add a numeric code describing a lamp s color to the string of characters identifying the model replacing the cw wwx etc designations. Whether you are buying a fluorescent bulb for the first time or ordering a replacement the first place you need to look is the fixture. Light bulb sizes and shapes chart including the different kind of light bulb bases.