What emissivity should I use for LED strips?

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Discussion Overview

The discussion revolves around the appropriate emissivity value to use when measuring the temperature of LED strips with an infrared thermometer. Participants explore the implications of emissivity on temperature readings and consider various methods for accurate measurement, including calibration techniques and the specific parameters of the LEDs being measured.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant suggests using the emissivity of white plastic (0.84) for measuring the temperature of LEDs but questions if there are better options.
  • Another participant proposes calibrating the infrared thermometer with a thermocouple or using a temperature-controlled oven to ensure accurate readings.
  • Several questions are raised regarding what is meant by "the heat," including whether the measurement pertains to the temperature of electrical components, power dissipation, or infrared light emitted.
  • A participant clarifies that they are measuring the temperature of white LEDs (1800K) to adjust voltage and prevent heat damage to the components.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate emissivity value and measurement techniques, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

There are unresolved questions regarding the specific conditions under which measurements are taken, such as the influence of LED light during measurement and the definitions of "heat" in this context.

HomeExperiement
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Hi!

I want to measure the heat of LEDs on my DIY LED panel with my infrared thermometer. That means that wrong emissivity could be like +/- 10 C in some cases. Should I take emissivity of white plastic which is 0.84 or are there any better options? Also does IR thermometer care if light from LEDs is shining while measuring?

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Calibrate with a thermocouple (or similar contact thermometer)? Or, put it in a temperature controlled oven and leave it long enough to equilibrate, then use you IR device to measure its known temperature.
 
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HomeExperiement said:
I want to measure the heat ...
What is "the heat" ?
What is the LED colour, white, grow, or IR ?
Do you want to measure:
1. The temperature of the electrical components, and/or the enclosure ?
2. The power dissipated by the assembly ? (maybe use power = current * voltage)
3. The infrared light emitted ?
 
Baluncore said:
What is "the heat" ?
What is the LED colour, white, grow, or IR ?
Do you want to measure:
1. The temperature of the electrical components, and/or the enclosure ?
2. The power dissipated by the assembly ? (maybe use power = current * voltage)
3. The infrared light emitted ?
LED color is white (1800K).
Want to measure the temperature of components so that I can adjust voltage to low enough to avoid heat damage to LEDs.
 

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