TM-21 LED Lifetime Calculator

Calculate LED fixture lifetime projections based on LM-80 test data using the ANSI/IES TM-21-19 standard

TM-21 Lifetime Calculator

LED lifetime projection based on LM-80 data

LM-80 Test Conditions

Test Temperature (°C)

Test Duration (hours)

Sample Size

Drive Current (mA)

Lumen Maintenance Data

Data Points (hours, % maintenance)

Enter as CSV: hours,percentage (one per line)

About TM-21 Calculations

TM-21 is the IESNA approved method for projecting long-term lumen maintenance of LED light sources using LM-80 data. Projections are limited to 6x the test duration for 20+ sample sizes.

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