Practice question

What is the IES TM-21 standard?

  1. A standard for pole structural testing
  2. A method for projecting long-term LED lumen maintenance based on LM-80 test data to predict when the LED will reach L70 life
  3. A standard for wire sizing
  4. A standard for photocontrol testing

Answer: B — A method for projecting long-term LED lumen maintenance based on LM-80 test data to predict when the LED will reach L70 life

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