Skip to content
Free Shipping on most orders over $175 | Sales Tax in NJ only
Free Shipping on most orders over $175 | Sales Tax in NJ only
Front display of M400 PAR Meter and Spectrometer showing spectral output, PPFD, CCT, and full-spectrum light data.

Mammoth Lighting PAR Meter and Spectrometer

by Mammoth Lighting
8% Discount Code Inside
$499.00
$499.00 - $529.00
$499.00
$449.00
$449.00 - $479.00
$449.00

Get 8% off with MML8

🌿 Free shipping on U.S. orders $175+, unless noted above

🌿 Canada, AK & HI: Add'l shipping charges

🌿 Price match guarantee, details here

Cash Payment Discounts & Financing Options

Get an additional 3% off when you pay by ACH, Money, or Zelle. Select your option at check out.

We accept all major credit cards, crypto and Paypal 0% credit plans. More details here.

Full Manufacturer’s Warranty

You buy it, we back it! Your purchase is fully covered with a manufacturer’s warranty. More details here.

Full spectrum analysis from 380 to 780nm with 2nm resolution, touchscreen interface, and 24-hour battery life at a fraction of lab-grade cost.

The Mammoth Lighting M400 PAR Meter & Spectrometer is built for growers, researchers, and lighting professionals who demand accurate, real-world data. Featuring a high-speed CPU and precision CCD sensor with a long focal cross asymmetric CT spectroscopy system, it delivers 2nm optical resolution and full-spectrum coverage from 380–780nm with accuracy within 5% of Apogee and $2000+ lab meters.

Unlike basic PAR meters that only measure PPFD, the M400 gives you a complete spectral profile, lux, irradiance, color temperature, CRI, chromaticity maps, and spectral distribution. Its lightweight all-aluminum body, 3.5" HD touchscreen, and 24-hour battery life make it the most versatile field tool for analyzing grow light performance at scale.

Why it’s a smart investment for you

Most meters cost more while providing less data. The M400 PAR spectrometer offers a full lighting analysis suite, helping you dial in efficiency, spectrum control, and canopy performance without relying on guesswork. For professional cultivation, R&D, or commercial facility audits, it’s a fraction of the cost of lab-grade instruments.

Features

  • 380–780nm wavelength range with 2nm resolution
  • Full spectral analysis: PPFD, CRI, chromaticity, color ratios
  • Electronic shutter system detects strong and weak signals
  • Data export option (via beta software)
  • Durable alloy build with 24-hour continuous battery life

Function Capabilities

  • PPFD PAR: Photosynthetic Photon Flux Density measurement
  • Spectral Distribution Map: Full spectral profile
  • Color Temperature (Tc K): Accurate lighting analysis
  • Illuminance (E lx): Lux measurement
  • Irradiance (Ee W/m2): Light intensity
  • Chromaticity Coordinates (x,y)
  • Relative Spectral Power Distribution P
  • CRI (Ra, Ri 1–15): Full-spectrum color rendering accuracy
  • Chromaticity & Color Tolerance Maps
  • Wavelength Data: Main, peak, half-width
  • Color Ratios: Purity, red, green, blue analysis
  • Export Capability: Per-nanometer spectral data

What's Included?

  • Mammoth Lighting PAR Meter and Spectrometer
  • Charging Cable and Adapter
  • Case

Specifications

Model: M400 Spectral Color Illuminometer

Wavelength Range: 380–780 nm

System: Long focal cross asymmetric CT split beam

Sensor: High-precision CCD

Spectral Bandwidth: 2 nm (FWHM)

Resolution: 0.2 nm

Wavelength Accuracy: ±0.5 nm

x,y Accuracy: ±0.0015 (±0.0005 repeatability)

Illuminance Range: 0.1 lux – 2,000 Klux

CRI Accuracy: ±1.5%

Screen: 3.5" IPS HD touch display

Color Temperature Range: 1,000K – 100,000K

Battery Life: 24 hours continuous testing

Grow Light Central expert advice for indoor growing equipment

Who should use this PAR meter and spectrometer?

  • Professional growers who need accurate PPFD and spectrum readings to dial in lighting
  • Researchers and labs requiring precise data across the 380–780nm range
  • Lighting enthusiasts comparing fixtures and optimizing grow room efficiency
  • Commercial facilities looking for lab-grade accuracy at a fraction of the cost

Best applications

  • Full spectral analysis for optimizing veg and flower light recipes
  • Grow light testing with accuracy within 5% of Apogee and $2000+ lab meters
  • Portable field use with 24-hour battery life and compact aluminum build
  • Data-driven grows exporting per-nanometer spectral data for detailed tracking

Why Shop with Grow Light Central?

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

Grow Light Central is a grow equipment solution provider connecting you to 100+ brands and 60+ suppliers trusted and used in the best grow facilities across the country.

Anthony, the owner and operator, personally ensures every order is handled right. No passing you off, no runaround, just the expert service and advice you deserve.

FAQs