TERALED

Measurement Environment

Thermal Characterization of Solid State Lighting

Technology Overview: LEDs offer improved efficiency compared with conventional lighting, but operate at much lower temperatures and need to be cooled by conduction rather than radiation. This webinar describes the thermal characterisation...

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TERALED is aimed at the combined thermal and radiometric/photometric characterization of high power LEDs. The TERALED system is designed to be used as a special measurement environment, as an add-on option for T3Ster, or as a stand-alone optical measurement system for LEDs.

A 300 mm diameter integrating sphere hosts the temperature controlled DUT fixture, a temperature stabilized reference LED and detector head with a bank of different filters which include equispectral, V(λ), V'(λ), Xshort, Xlong and Z. The detector with photometric filter is matched to the CIE V(λ) function with 1.5% accuracy (f1 error).

To obtain combined optical/thermal measurements, T3Ster is used to provide powering for the LED under test. The control of the thermal measurements and the evaluation of the thermal transients is performed by T3Ster while the measurement sequences required for the photometric and radiometric characterization are performed by TERALED. The measured emitted optical power then is considered by T3Ster when calculating the thermal metrics of the LED under test and the light output characteristics shown by TERALED are provided as function of the real junction temperature. Measurement over a wide range of forward current and LED temperature values is 100% automated thus allowing measurement in a few hours as opposed to manual procedures which could take multiple days.