JAZ Light Meter

JAZ Light Meter Spectroradiometer

An irradiance spectroradiometer that's as easy to use as a lux meter

Further Information	Knowledge Base
» JAZ Light Meter Datasheet	» LED Measurements - Photometry vs. Spectroradiometry
	» JAZ Spectrometer Manual
	» JAZ-A-IRRAD Manual
	» SpectraSuite Software Manual
Related Products
» Spectrometers
» Illuminance Meters

The revolutionary JAZ Light Meter from Ocean Optics is based upon a CCD spectrometer, but unlike standard devices, the JAZ is fully self-contained and does not need to be tethered to a PC. With on-board photometric processing, plus battery pack, data storage and an integrated OLED display, the JAZ Light Meter is the first truly portable spectroradiometer for measuring the spectral irradiance and illuminance of light sources.

The Truth, the Whole Truth and Nothing but the Truth

The JAZ Light Meter functions as an illuminance colorimeter but unlike tristimulus filter-based meters, the JAZ reports the correct illuminance (in lux) regardless of the type of light source under test. It has become common knowledge that inexpensive lux meters can give very misleading readings with narrow spectrum light sources such as LEDs. For comparison measurements on two similar LED devices, that may not be an issue, but if you care about the absolute illuminance, chromaticity or colour temperature of your light source, the accepted wisdom is that you should use a spectroradiometer. The only drawback has been that scanning spectroradiometers are bulky, slow and expensive, whilst compact CCD array spectrometers - whilst fast and affordable - have needed to tow a PC around with them.

The JAZ changes all that. It is the first totally portable spectroradiometer that can be taken out of the laboratory - just point the JAZ at your light source and it will report the exact illuminance in lux. Data is saved to an on-board SD card memory and you can download your measurements to your PC for further analysis and computation of colorimetric parameters with SpectraSuite software (available separately) when you return to your desk. SpectraSuite will compute the CIE chromaticity, correlated colour temperature, colour rendering and many other colorimetric metrics (see specification table below for full details).

JAZ Light Meter Accessories

The JAZ Light Meter Package

The JAZ Light Meter is a pre-configured, pre-calibrated JAZ spectrometer that combines an OLED display with CCD array spectrometer, reverse orientated keyboard, direct attach cosine diffuser, battery pack and ethernet module. On-board processing of spectroradiometric data and calculation of illuminance and PAR (photosynthetically active radiation) is performed by the JAZ-A-IRRAD software application which is supplied on an SD card that simply slots into the JAZ. The battery module enables you to measure for up to 8 hours typically without recharging, while JAZ's other SD card slot gives you a convenient way to store your spectral data. You can also download data from JAZ onto your PC for post processing and analysis with SpectraSuite.

The JAZ Light Meter package includes a rugged Peli case for safe transport and storage, while a light weight JAZ-Pack soft carry case is provided for when you want to travel light. The flexible JAZ-Mount tripod makes it simple to place the JAZ on a stable surface and tilt it towards the light source you wish to measure.

Specifications & Ordering Information

Model	JAZ Light Meter
Product Code	JAZ-ULM-200
Performance
Spectral Range¹	300 ... 850nm
Spectral Resolution	< 2nm
Signal to Noise²	250:1
Dynamic Range³	1300:1
Integration Time	1ms ... 65 seconds
Stray Light	< 0.05% @ 600nm
	< 0.10% @ 435nm
Corrected Linearity	> 98.8%
Dark Noise	50 RMS counts
JAZ-S Spectrometer Module
Design	f/4 symmetrical crossed Czerny Turner
Focal Length	42mm input, 68mm output
Diffraction Grating	Grating #2, 600g/mm
Entrance Slit	10µm
Order Sorting Filter	200 ... 850nm
Detector Lens	L2
Fibre Optic Connector	SMA-905 to 0.22 NA optical fibre
Type	Linear CCD array, uncooled
Pixels	2048
Pixel Well Depth	~ 62,500
JAZ-DPU-R OLED Display Module
Display Module	OLED, 128 x 64 character
Keypad	Reverse orientation
Processor	Embedded processor
Interface	USB 2.0
Power Consumption	~ 2.5W
JAZ-B Battery & Memory Module
Battery Type	Lithium-Ion, rechargeble
Battery Life	~ 8 hours before recharging
Data Storage	x 2 SD card slots
JAZ-E Ethernet & Memory Module
Ethernet	100 Mbps, IEEE 802.3 compliant, 10/100
Data Storage	x 2 SD card slots
JAZ Light Meter System Configuration
JAZ-S	Spectrometer Module
JAZ-DPU-R	OLED Display Module, reverse orientation keypad
JAZ-B	Battery & Memory Module
JAZ-E	Ethernet & Memory Module
JAZ-A-IRRAD	Photometric & PAR software on SD card
JAZ-Mount	Flexible tripod mount for JAZ
CC-3-DA	Cosine diffuser
SPEC-CAL	System calibration, 300-850nm, µW/m².nm
Miscellaneous	Peli case & JAZ-Pack
Measurement Capabilities
On Board⁴	Illuminance (lux)
	Photosynthetically Active Radiation (PAR)
With Post Processing⁵	Spectral irradiance, 300 ... 850nm (µW/cm².nm)
	Illuminance (lux)
	CIE tristimulus coefficients (XYZ)
	CIE 1931 2° chromaticity xy
	CIE 1964 10° chromaticity uv
	CIE 1976 10° chromaticity u'v'
	Correlated colour temperature, CCT (Kelvin)
	Colour rendering, R_a & R_1-14
	Dominant wavelength & purity
	CIE whiteness & tint
	Hunter Lab Lab*
	CIELAB hue-angle & chroma
Accessories
PC Software	SpectraSuite (required for post-processing & colorimetric computation)

1. Spectral range is determined by the working range of the grating and by the spectral range of the calibration.
2. At full signal.
3. For a single acquisition.
4. These are the parameters which the JAZ Light Meter will compute and display without the need for a computer.
5. These are the parameters which require the measurement data be processed using SpectraSuite software (optional
accessory).