data sheet (PDF 0.7 MB)

Uniform light source / luminance standard LDN 10-5

General and applications
The OPTRONIK LDN 10-50 is an integrating sphere uniform light source with color temperature regulation. Each model includes a sphere photometer and control unit. The LDN 10 luminance standard creates on its light emitting surface a luminance which is accurately defined.

Alternatively, you can control constant luminance or color temperature. The LDN 10 is therefore an excellent tool for testing and calibrating a variety of photometers, such as:

• Luminance meters
• Retroreflectometers
• Photo receivers
• Colorimeters and video cameras
  

The LDN 10-5 model has a diameter of 500 mm. The light emitting area has a diameter of 100 mm (LDN 10-5), which can be reduced in size to 3 mm with an optional iris diaphragm. The power supply is integrated into a separate control unit.

A keyboard on the control device's front plate serves to control the following functions:

• Automatic maintenance of constant luminance
• Automatic maintenance of constant color temperature
• Continuous adjustment of luminance and/or color temperature
• Storage of frequently used values

The measured values are indicated on a separate display and control unit.

An RS-232 serial interface allows for control of the LDN 10 via PC; e.g., if the device is used for automated measuring applications.

Technical data
- Integrating sphere, Ø 500 mm
- Sphere material: Aluminum
- Special sphere coating diffuse (Lambertian) reflecting, 80% reflectance, spectral characteristics according to DIN 5032
- Halogen incandescent bulb 12 V / 100 W
- Baffle to shield the light exit port against direct light
- 3 Si-photo detectors to regulate luminance and correlated color temperature
- Light exit port with diffuse cover, Ø 100 mm
- Luminance at standard illuminant A approx. 1100 cd/m²
- Luminance range approx. 200 ...2200 cd/m2
- Uniformity of luminance > 98% on a center circle of Ø 90 mm
- Total dimension with stand: 500 mm x 700 mm (height)
- Weight: Approx. 15 kg

Display and control unit / Lamp power supply
- Table housing, optionally to be integrated in 19" configuration
- Lamp power supply for halogen bulb 100 W
- Microprocessor-controlled electronic regulation unit, regulation of either voltage, luminance, or correlated color temperature
- Regulation range of correlated color temperature: 2500 K ... 3000 K
- Digital display of lamp voltage, luminance, and correlated color temperature on graphic LC display with
  background illumination
- Integrated lamp burning time and switching cycle counter
- Serial interface (RS-232) for remote control and readout of measured values
- Mains supply: 230 V / 50 Hz, max. 130 W
- Power cable with Euro plug
- Calibration traceable to PTB standard with X-Rite Optronik calibration certificate

Options
- Additional X-Rite Optronik calibration certificate for luminous intensity
- Measured color filter with specification of chromaticity coordinates
- Filter for conversion to other illuminants
- Power supply for 115 V, 50-60 Hz