... streetlight,tunnel lamp, etc.Test parameters: voltage, current, power, power factor, wavelength,luminous flux, light efficiency, chromaticity coordinates ... . Rapid and steady test result.ProgrammableDC(or variable frequency) power source, constant current and voltage output.Standardwith 30V ... /5Aprogrammable high performance drive power. Voltage readback precision is0.02%+5mV. ...