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LED Characteristics Apparatus

Product Code : SCL-PLE-11717

Quick Answer: The LED Characteristics Apparatus is a workstation for plotting forward V-I curves of LEDs of different colours, with a variable DC supply set by multi-turn potentiometers, voltage and current meters and built-in current-limiting resistors.

Last updated: 18 October 2026

Key Features

  • Array of LEDs emitting at different wavelengths.
  • Variable regulated DC supply with multi-turn fine control.
  • Meters for voltage and for current in µA/mA.
  • Built-in current-limiting resistors protect the LEDs.

Technical Specifications

SpecificationValue
Light sourcesMulti-LED array, several colours
SupplyVariable regulated DC
Voltage controlMulti-turn potentiometers
MetersVoltage, and current in µA/mA
ProtectionBuilt-in current-limiting resistors

How It Is Used

Each LED is forward biased and the voltage raised in small steps while current is recorded, giving its V-I curve and knee voltage. Comparing the knee voltages of LEDs of different colours shows how emitted wavelength relates to band-gap energy and can be used to estimate Planck’s constant.

Frequently Asked Questions

Can Planck’s constant be estimated with the LED Characteristics Apparatus?

Yes. The knee voltages of LEDs of different wavelengths are compared to relate photon energy to frequency.

Related Physics Lab Equipment

See the full physics lab equipment range, or these related semiconductor characteristics apparatus:

Laboratories and education suppliers in Fiji, Suriname, Morocco, Belgium and Palestine can source the LED Characteristics Apparatus from JLab India for export.

For a quotation on the LED Characteristics Apparatus, contact JLab India on +91-8569909696.

   
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