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.
Full screen display of the luminous spectrum
CIE 1931 chromaticity diagram with binning fields
Substitution correction menu
|Range of measurement||
20 lm to 3,200,000 lm, 380 nm to 750 nm
Inspection of incoming products (LED lamps), quality assurance in production processes, design
Factory calibration. Traceable to international standards
Luminous flux calibration +/-8%
|Input optics - ISD-100HFT-V01||
Turnable Integrating sphere with barium sulfate coating. 1000mm internal diameter. An openable hemisphere. Port plugs for closure of the measurement port. UMSH-AP-1000 height-adjustable sample holder.
This device is based on the BTS256-LED, please find detailed specification there.
|Measurement Range and Measurement Time||
BTS256-LED: max. 1000 lm ≤ 5ms (white light)
BTS256-LED: min. 10 mlm ≤ 30s (white light)
BTS256-LED with ISD-100HF-V01: max. 3200000 lm ≤ 5ms (white light)
BTS256-LED with ISD-100HF-V01: min. 25 lm ≤ 30s (white light)
|Max. measurable luminous flux||
BTS256-LED typ. 70000lm
BTS256-LED with ISD-100 typ. 32000klm
|Noise equivalent luminous flux||
BTS256-LED Tester typ. 0.05 mlm
|Produktname||Product Image||Description||Show product|
|S-SDK-BTS256||Software Development Kit for BTS256 variants.|
|UMLA-SHAP-E27||Bulbs measuring socket for the use with integrating spheres.
Features: E27 socket. Quadrupole connecting the lamp to a galvanically isolated power supply and voltage measurement
|UMLA-SHAP-E14||Bulbs measuring socket for the use with integrating spheres.
Features: E14 socket. Quadrupole connecting the lamp to a galvanically isolated power supply and voltage measurement
|UMLA-SHAP-G9||Bulbs measuring socket for the use with integrating spheres.
Features: G9 socket. Four-line connection of the lamp socket for a separate power supply and voltage measurement.
|UMLA-SHAP-GU10||Bulbs measuring socket for the use with integrating spheres.
Features: GU10 socket. Four-line connection of the lamp socket for a separate power supply and voltage measurement.
|UMLA-SHAP-GU5.3||Bulbs measuring socket for the use with integrating spheres.
Features: GU5.3 socket. Four-line connection of the lamp socket for a separate power supply and voltage measurement.
|UMLA-SHAP-GX53||Bulbs measuring socket for the use with integrating spheres.
Features: GX53 socket. Four-line connection of the lamp socket for a separate power supply and voltage measurement.