Profile: Labsphere, Inc. specializes in light measurement and sensor calibration. Our product line includes spectrometers, handheld photometer, LED sockets, laser power measurement, absorption correction lamps, detector assemblies, filters & filter holders, light sources, motor controller, mounting hardware, power supplies, sample holders and variable attenuators. Our variable attenuators allow the user to control or vary the light entering from an external light source into an integrating sphere. Our HLMS-200P instrument measures luminous flux from sources such as LEDs, small lamps and fiber illuminators.