ITC Reefculture

PARwise USB Light Meter

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$299.99 $299.99

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All the Metrics Needed to Make Informed Decisions about your Aquarium Light 

  • Compatible with any light source
  • Can be used wet or dry
  • Works with Windows PC, macOS*, and Android devices
  • Measures multiple lighting metrics:
    • PAR (PPFD – Photosynthetic Photon Flux Density µMol/m2/S)
    • Kelvin (Color temperature)
    • LUX
    • Spectrum
    • DLI (Daily Light Integral)
    • Peak Wavelength
    • Hue (Color)

*Note: Smart device for viewing results not included. This light meter is not compatible with iOS devices (iPads or iPhones), as it requires access to a Chrome-based browser.


PARwise is ITC Reefculture's latest tool which ends the question of what setting the aquarium lights should be on, whether that be brightness, color (spectrum), or photoperiod. PARwise empowers reef keepers to make the right decisions over their lighting settings. Perfect growth rates need three things: The correct wavelengths, the correct light intensity, and both for the right amount of time. Light changes with depth and clarity, too, do the requirements of plants and animals. Unfortunately, the human eye is not particularly good at understanding light levels and colors!PARwise provides a simple-to-use light meter that will give you a deep understanding of your lighting and how to tune it to perfection—designed and manufactured in the United Kingdom.



  • PAR Range: 0-6000 µMol/m2/s
  • Kelvin: 1000-10,000 Kelvin
  • LUX: 2-300000
  • Accepted Light Sources: Natural, LED, Fluorescent, Incandescent, Gas Vapour, HID
  • Optical Measurement Type: Point Light Source
  • Spectral Range: 380 to 800 nm
  • Calibration Uncertainty: ± 5%
  • Measurement Repeatability: Less than 0.5%
  • Directional Cosine Corrector: Replaceable
  • Temperature Response: Autocompensating
  • Ingress Protection Rating (IPR): IP68
  • Dimensions: 3.35"L x 1.57"W x 0.79"H
  • Device Weight: 130g


What's Included?

1x ITC Reefculture PARwise Light Meter

1x USB-C Adaptor



More Information
UPC 886455002208
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Product Questions

Will this work for freshwater planted tanks
Question by: Robert Thomas on Feb 26, 2024, 9:26 AM
Hey there,
Thank you for reaching out to us. Good question Robert. Yes this meter will be Compatible with any light source. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Feb 26, 2024, 11:20 AM
How long is the cord?
Question by: Tim on Dec 2, 2023, 10:00 AM
Hi there! The cord on this unit is 2.5 meters (a little over 8 feet) long from sensor to plug!

I hope this helps!
Answer by: Taylor L. (BRS Staff) on Feb 8, 2024, 1:30 PM