Integrating Sphere System
LMS is designed to characterize opto-electrical property of light sources at various driving condition and operation temperature with fully automated control program. It consists of integrating sphere, Spectrometer, power supply, temperature control unit and auxiliary / standard lamp.
▣ Types of Integrating Sphere
LMS-120 LMS-200 LMS-400 LMS-800
▣ Ambient Temperature Controller
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TC 850 controls ambient temperature inside sphere with Air Circulation Heating Coil Module. It can accomplish temperature from 20oC ~ 85oC with + 0.2oC accuracy. It consists of temperature control unit and monitoring unit |
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Auto sequence measurement can be set for aging, idle and on/off time along with input voltagte and current setting for temperature dependance of LIV curve. |
▣ Operation Program
▣ Spectrometer Selection Chart
주1. Measured with collimating lens mounted with 600um fiber input
주2. Unit: W/m^2nm
▣ Opto-elecrtical property vs. operation Temp.
LED itself and lighting shows a huge variation as ambient temperature changes therefore it is necessary to define its performance at R&D stage. In general, high power LED shows spectrum shift from 0.1 to 0.3nm/K and luminous flux drop around B(-0.05%/oC) => W(-0.3%/oC) => G(-0.35%/oC) => R(-0.83%/oC) => A(-1.05%/oC).
Luminous Flux vs. Ambient Temperature Spectral Distribution Change Lumen per CW and PWM Color Coordinate Shift Peak Wavelengh Shift Luminous Efficacy Change Forward Voltage Change Vf, Board Temp. at 65℃ Lumen per frequency at 60% duty
