JAZ Light Meter
An irradiance spectroradiometer that's as easy to use as a lux meter
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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).
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, Ra & R1-14 |
|
|
Dominant wavelength & purity |
|
|
|
CIE whiteness & tint |
|
Hunter Lab L*a*b* |
|
|
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).