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Free bulb tools
Use the old lamp and fixture label together. These tools organize what you can observe; they do not turn a visual match into electrical compatibility.
01
Interactive checker
02Find my bulb
Turn the old bulb code, connection, fixture, voltage, size, and ratings into a replacement brief.
Start the check →Calculator
03Beam spread calculator
Estimate the diameter and area of a spot or flood beam from its published angle and throw distance.
Calculate a footprint →Printable SVG
04Bulb label decoder
Record the fields that matter without treating a manufacturer part number as a universal code.
Open the decoder →Printable SVG
Screw-base measuring guide
Compare the removed bulb with nominal E12, E14, E17, E26, E27, and E39 thread diameters.
Open the measuring chart →