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System for the luminous flux measurement of 2π and 4π light fixtures. Features: Turnable Integrating sphere with a 1000 mm diameter, extra measurement ports for 2π luminaires with diameters of up to 254mm and auxiliary lamp. Light meter for acurate measurement of luminous flux, spectral radiant power, CCT, CRI, chromaticity coordinates, User software, etc.
The lamp position influences the luminous flux
LED lamps are often manufactured with integral driver circuitry. Here, the lamp orientation (base up, base down, etc) position can have a significant effect on the junction temperature of the LEDs due to the altered heat flow. Luminous flux, spectrum and color are directly related to junction temperature. The lifetime of LEDs is also reduced as junction temperature is increased. The measurement of photometric properties of LED lamps in the different positions is therefore highly recommended. The ISD-100HFT-BTS256-LED light meter from Gigahertz-Optik is a spectroradiometer with a rotatable, 100 cm diameter, integrating sphere. This combination can be used to measure the luminous flux, spectrum, color, and color rendering index of LED lamps operating in any orientation.
The BTS256-LED light meter
In its standalone mode, the compact BTS256-LED meter is designed for the convenient measurement of luminous flux, spectrum, color, and color rendering index of single LEDs. A key feature is the conical measurement port at the entry of the internal integrating sphere which enables the measurement of onboard LEDs. The bayonet connector used to attach the conical adapter makes it possible to combine the BTS256-LED with other accessory components. Gigahertz-Optik offers different accessories as part of the BTS256-LED Plus Concept which greatly extends the measurement capabilities of the BTS256-LED.
Enhancement of the BTS256-LED using the ISD-100HFT-V01 or ISD-100HFT-V02 integrating sphere
A special feature of the ISD-100HFT-V01 sphere is that it can be rotated around its frame. This allows for the operation of LED lamps in standing (lamp base down), lying (lamp base horizontal), and hanging (lamp base up) positions. One hemisphere can be opened to allow easy access to the sample holder. The height of the sample holder can be adjusted for perfect positioning of the LED lamp at the center of the sphere. In order to operate the test lamps outside the integrating sphere, the ISD-100HFT-V02 version has an extra measurement port that has a 254 mm diameter. This remains closed when not in use. Both variants are equipped with an auxiliary lamp. The BTS256-LED can also be used without the sphere.
One essential quality feature of photometric devices is their precise and traceable calibration. The ISD-100-HFT with the BTS256-LED is calibrated by Gigahertz-Optik’s calibration laboratory that is accredited by DAkkS (D-K-15047-01-00) for the spectral responsivity and spectral irradiance according to ISO/IEC 17025. Calibration for the luminous flux is performed using a BN-LHSF-104, which is placed at the sphere center. Spheres with an additional measurement port require additional calibration with a BN-LHSF-2P-20 calibration lamp, which has 2pi radiation characteristics in the integrating sphere. Every device version comes with its respective calibration certificate.
BTS256-LED spectroradiometer with rotatable 1 m Diameter integrating sphere for 2 pi and 4pi LED lamps
The lamp position can be changed by simply rotating the sphere
BTS256-LED for measurement of the luminous flux, spectrum, color, and color rendering index of single LEDs
The S-BTS256 user software for the luminous flux with integrated and external sphere.
CIE 1931 chromaticity diagram with binning fields