What LM-80 measures
LM-80 measures maintenance of light-output characteristics of solid-state light sources such as LED packages, arrays and modules under controlled conditions. It is source-level evidence; it is not a test of every part of the final installed luminaire. [1]
What TM-21 projects
TM-21 projects long-term source flux maintenance from LM-80 data, subject to extrapolation limits. A projection is different from observing the entire stated period in a complete installed system. Request the underlying data, operating assumptions and reported projection conditions. [2]
What the owner must maintain
Our maintenance review includes optics, dirt, drivers, connections, controls, enclosure conditions and replacement access. A component-level flux projection does not answer whether a driver is replaceable, whether cleaning is feasible or whether spare parts will be available.
Plan for maintained performance
Record the light-loss assumptions used in design and how maintenance will support them. State what will be cleaned, inspected, replaced and rechecked. Do not apply an unexplained generic factor simply to make a calculation pass.
Preserve the configuration
After replacement, confirm output, optics, color characteristics and controls match the accepted design. Maintain an asset register with exact configurations and reports. A visually similar housing can contain a substantially different light engine or distribution.