Pro Lite Technology

Specbos Spectroradiometers

The Specbos is a versatile, miniaturised spectroradiometer with the ability to measure both spectral radiance and spectral irradiance in one instrument - and the corresponding photometric quantities of luminance (cd/m2) and illuminance (lux). Specbos models provide for measurements in the 250-1000nm range, with specialist versions available for flash photometry and average LED intensity in accordance with CIE 127:2007. There are also Specbos models configured for measuring the reflected colour of materials.

Specbos Range Overview

1211 UV
1201 FOCUS
1211 FOCUS
1201 FLASH 1401 2101
380-780nm  380-780nm 380-780nm
Luminance & iIlluminance Luminance of small objects Luminance, illuminance
& luminous exposure
Near-field (average) LED luminous intensity per CIE 127:2008 Reflectance & reflected colour



Ease-of-use and flexibility are key to the popularity of the Specbos. It can be converted from making measurements of spectral irradiance to spectral radiance simply by removing the clip-on cosine receiver. At the same time, the chart in the software automatically changes from an irradiance to a radiance scale. A built-in red laser pointing device conveniently defines the measurement spot for luminance measurements. The minimum measurement spot size is 4mm, athough additional focussing optics are available to reduce this for testing smaller objects such as alpha-numeric displays.

The Specbos is controlled from LiMeS software for Windows via a USB 2.0 interface. Other interfaces are available to special order - these are an RS232 serial interface, a Bluetooth/USB interface or a LAN/USB interface. The Specbos will accept a TTL signal to trigger the start of a measurement. Power to the Specbos is delievered over the USB interface. LiMeS software is included as standard with each Specbos.

The JETI Software Development Kit is supplied as standard and provides a simple, high-level Application Programme Interface (API) to provide complete connectivity with the Specbos. The API is provided in the form of several Windows Dynamic Link Libraries (DLL). The libraries can be used by any programming language that can handle DLL’s such C/C++, VisualBasic, or LabVIEW.

Apart from the spectral power distribution, software computes the following parameters: luminance; radiance; illuminance; irradiance; luminous and radiant intensity; CIE xy and u'v' chromaticity coordinates; dominant wavelength and purity; correlated colour temperature (CCT); and colour rendering (CRI, Ra, R1-14).

The LiMeS software also includes hazard weighting functions for photobiological safety assessments per EN 62471, circadian metrics and provides for the measurement of photosynthetically active radiation (PAR). For LED testing, the software provides binning and ranking tools and CIE chromaticity diagrams with target SDCM / MacAdam ellipses.

Specbos 1201

The Specbos 1201 operates in the visible wavelength range, from 380 - 780nm with a bandwidth of 5nm. For illuminance measurements, the Specbos 1201 has a range from 10 to 100,000 lux. For radiance and luminance measurements the Specbos has a 1.8° viewing angle, and a range from 19 - 70,000 cd/m2. A TTL input allows for a trigger input for synchronising the measurement of pulsed light sources.

» Download Datasheet

Specbos 1211 / 1211 UV

The Specbos 1211 employs a more sensitive, back-thinned CCD detector array with electro-mechanical shutter for dark signal compensation and provides an extended wavelength coverage of 350 - 1000nm, with a bandwidth of 4.5nm. The 1211 UV provides for measurements into the ultraviolet, from 250 - 1000nm. Additional neutral density (ND) filters, a 90° cosine collector and a cosine receiver at the input of an optical fibre are available as accessories for the Specbos 1211.

» Download Datasheet

Specbos 1201 / 1211 FOCUS

The 1201 FOCUS and 1211 FOCUS are configured to accept removeable focussing optics to reduce the measurement spot size from the standard 4mm, down to 3, 1 or 0.5mm. The focussing optics simply screew on but the Specbos must be supplied configured for use with the optics, so standard 1201 and 1211 instruments cannot be easily retrofitted. The measurement spot is conveniently illuminated by the red laser spot. The smaller measurement spot sizes allow the Specbos to accurately measure the luminance of alpha-numeric displays, back-illuminated signs and other small light sources.

Specbos 1201 FLASH

For light sources that comprise single or continuous flashes, the 1201 FLASH version of the Specbos can measure luminous exposure. An additional detector mounted within the front face of the 1201 FLASH optically synchronises to the light source and measures the pulse length of the light flashes. The Specbos 1201 FLASH can measure the luminous exposure for both repetitively flashing sources with frequencies from 0.2 to 20Hz and a single flash with a duration of less than 200ms. Luminous exposure (notation Hv) is measured in lux seconds (lux * seconds).

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Specbos 1401

The Specbos 1401 combines a Specbos 1201 with measurement optics designed to satisfy the requirements for near-field (average) luminous intensity as defined in CIE 127: 2007, conditions
A & B. 

» Download Datasheet

Specbos 2101

This version of the Specbos is designed for reflectance measurements in the 380 - 780nm visible wavelength range. An optical fibre probe comrising of 6 outer illuminatinf fibres and a central collecting fibre is used to measure the reflectance of the material under test.

» Download Datasheet

Specbos 4001

The 4001 is a reflectance spectrophotometer that measures the colour of materials using a 45° angle of illumination and 0° collection.

» Download Datasheet


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