Scope and starting point
Start by identifying what the number describes: an absolute limit, recommended operation, bin boundary or typical test result. Keep the part suffix and source revision with it. Two LEDs sharing a package size may have different emitters, pads, optical surfaces and permissible currents.
Selection notes
Check the exact color bin, drive current, junction temperature and footprint. Package dimensions are not the light-emitting surface. Compare flux or efficacy only at equivalent current, temperature, CCT and CRI; confirm soldering and optical compatibility separately.
Keep a reproducible record
Save the complete part number, source revision, operating point and the reason for each decision. Keep calculated examples separate from observed results. A measurement report needs its sample identifier, instrument and calibration details, stabilization, ambient conditions, raw record and uncertainty statement. Do not replace a missing value with zero or a typical value with a guaranteed limit.