LEDs vary in terms of their luminous flux and light color based on tolerances in the manufacturing process. Manufacturers sort LEDs in various specific groups through binning. To the user, LEDs only show their “true colors” after they have been assembled and under the operating parameters of the particular application. This means that temperature effects and operating parameters that vary from binning have an effect on the different luminous parameters.
The BTS256-LED tester can be used to measure the luminous flux, color temperature, Color Rendering Index and luminous spectrum of assembled individual diodes. The latest version of this compact light meter has a USB interface and comes with newer, further developed S-BTS256 user software. This is advantageous to customers because of faster data transfer among other features.
Gigahertz-Optik also offers complementary products for this measurement device that has the Bi-Technology sensor. These include integrating spheres with diameters of up to 1m, luminous intensity attachments, goniometers, etc.
Due to its innovative BiTec-Light sensor, the new BTS256-E light meter is tailored to the particularities of LED. The BiTec-Light sensor allows for compact measurement devices providing high quality measured values of illuminance, color rendering including CRI R15, luminous color and light spectrum, also applicable for pulse width modulated (PWM) light. In addition to the stand-alone operation, the device can be operated in connection to a computer. The S-BTS256 software supports the various fields of application of the BTS256-E light meter due to its modular desktop appearance.
After eighteen years in the works CIE Technical Committee TC 2-47 has completed and published CIE 220:2016.  This technical report describes quality indices for UV radiometers, which enable manufacturers and users to characterize instruments on a common basis. To harmonize CIE documents, the quality indices described in this document relate to the quality indices described in Joint ISO/CIE International Standard ISO/CIE 19476:2014(E) (formerly CIE S 023/E:2013).