LM 79:2008

Electrical and photometric measurement of solid state lighting products.

Test Measurement Required:

• Total Luminous Flux
  The total visible light energy emitted by a source in all directions, where the luminous flux is the radiant flux multiplied by the human eye’s sensitivity.
  The unit of measurement for luminous flux is the lumen.
• Luminous Intensity Distribution
  A quantity which describes the power of a source or illuminated surface to emit light in a given direction.
• Electrical Power
  Rate of Electrical energy transferred in an electric circuit.
• Luminous Efficacy (calculation)
  Measurement of the efficiency with which the source provides visible light from electricity.
• Colour Characteristics
  
  • Chromaticity - Specification of the quality of colour regardless of its luminance.
  • Colour Temperature - The colour temperature of a light source is the temperature of an ideal black-body radiator that radiates light of comparable hue to that of the light source.
  • Colour Rendering Index- Effect of an illuminate on the colour appearance of objects by conscious or subconscious comparison with their colour appearance under a reference illuminate.

INTEGRATING SPHERE (4π MEASUREMENT)	INTEGRATING SPHERE	XY HANDLER AUTOMATED TESTER

 

LM 80:2008

Lumens maintenance of LED light sources Test Condition: Ambient conditions and setup Case Temperature measured and maintained Case Temperature measurement point Airflow minimized Operating orientation & spacing per manufacturer Electrical Voltage and Current (AC or DC levels) Voltage wave shape (harmonic distortion <3%) Current Regulation Instrumentation Constant Current Drivers Power Supplies Data logger

BURN IN TEST SYSTEM