NWSPEC
Spectral Irradiance Meters
Spectral Irradiance Meters
SRI Series Spectral Irradiance Meters
SRI (Spectral Radiometer Irradiance) series measures absolute spectral irradiance across UV, VIS, and NIR ranges. Built on high-performance spectrometer sensors, each model is optimized for specific wavelength bands and light intensity levels.
Step 1: What wavelength do you need to measure?
- UV region (200–400 nm) → SRI40 series (general) or SRI68 series (cooled, ultra-low light)
- VIS region (350–950 nm) → SRI50 series (general) or SRI63 series (cooled, low-light)
- UV-VIS broadband → Contact us for SRI50-UV or custom configuration
Step 2: How bright is your light source?
- Standard brightness (mW/cm² to W/cm² range) → General spectrometer, no cooling needed
- Low-light (μW/cm² range) → Cooled spectrometer (SRI63 / SRI68) for noise reduction
- Ultra-low / photon-counting → Deep-cooled detector with extended integration time
Quick Selection Guide
- 200–400 nm
- Standard irradiance
- General spectrometer
- Arc flash detection
- UV curing validation
- 350–950 nm
- Standard illuminance
- General spectrometer
- Lighting quality (CCT/CRI)
- Display calibration
- 350–950 nm
- Low irradiance level
- Cooled spectrometer
- Bioluminescence
- Weak LED characterization
- 200–400 nm
- Ultra-low irradiance
- Deep-cooled detector
- Photon-counting UV
- Research-grade UV-VIS
Full Comparison Table
| Model | Wavelength | Detector | Irradiance Range | Best For |
|---|---|---|---|---|
| SRI40-UV | 200–400 nm | General | Standard UV | Arc flash, UV safety, curing |
| SRI50-VIS | 350–950 nm | General | Standard VIS | Lighting CCT/CRI, lux meters |
| SRI63-LL | 350–950 nm | Cooled | Low-light | Bioluminescence, weak sources |
| SRI68-UVL | 200–400 nm | Deep-cooled | Ultra-low UV | Research, photon-counting |
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Frequently Asked Questions
How can I contact you?
Feel free to call us T+86 189-6516-4839
or email sales@nwspec.com to:
• Place an order
• Ask for a quote
• Or if you have any other questions
You will always get a live person here at NWSPEC; never an automated system!
We are open from 6:00AM - 7:00PM Eastern Time, Monday - Friday.
Where can I find application notes?
If you have any questions regarding the application notes, or can't find the one you are looking for, please contact Sales at sales@nwspec.com
Do you have instructional manuals for your instruments to download?
Yes, we have instructional manuals for our instruments. They can be found on https://nwspec.com/pages/resource .
If you don't see the one you are looking for, please contact: sales@nwspec.com