Downloadable Light Bulb Diameter Measuring Tool
Deciding which replacement lamp you need can be a difficult task, particularly if you are trying to measure across the diameter of a bulb. We have put together a handy scale diagram for you to refer to.
Simply print out and cut along the required lines and compare to the lamp you have. Remember to ensure 'Page Scaling' is set to 'none' under the 'Page Handling' options in the print window.
The tool has measurements for the following fluorescent tubes, reflectors light bulbs and PAR lamps:
T2, T4, T8, T10, T12
Reflector Light Bulbs
R39, R50, R64, R80, R95, AR111, R120, R125
P11, P16, P20, P25, P30, P36, P38, P46, P56, P64