Apogee MQ-500 PAR Meter for Professional Growers
The Apogee MQ-500 PAR meter and quantum PPFD sensor is engineered for growers who demand lab-grade accuracy when measuring photosynthetically active radiation (PAR) from 400–700 nm. Its enhanced silicon photodiode, custom optical filter, and acrylic diffuser are housed in a rugged, IP68-rated anodized aluminum sensor head that’s built for harsh grow room, greenhouse, and even underwater environments. With an accuracy uncertainty of just ±5% and long-term drift of less than 2% per year, this PAR light meter outperforms hobby-grade options and stays stable season after season.
Quantum PPFD Sensor for LED, HPS, and Sunlight
The MQ-500 quantum PAR meter is precisely calibrated to measure photosynthetic photon flux density (PPFD) in µmol m⁻² s⁻¹ across common grow light sources, including LED, HPS, MH, and sunlight, making it ideal for mixed-technology gardens. Three operating modes—spot, sample, and log—allow you to take instantaneous readings, manually store up to 99 measurements, or automatically log averages and daily light integral (DLI) over time for complete light mapping and crop steering.
Durable PAR Light Meter with Data Logging and DLI Tracking
Designed and manufactured in the USA, this LED PAR meter gives you consistent, repeatable data so you can fine-tune fixture height, dimming levels, and light uniformity at canopy level. The separate handheld meter displays real-time readings and stores logged data that can be downloaded via the Apogee AC-100 cable, helping you track DLI and optimize light intensity through different growth stages. With a four-year warranty and robust construction, the Apogee MQ-500 PAR meter is a long-term investment in precise grow light measurement and healthier, more productive plants.
Key benefits:
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True PAR accuracy for plants – Measures PPFD (µmol m⁻² s⁻¹) from 400–700 nm, so you see the light your crop actually uses, not just human-visible lux.
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LED-optimized quantum sensor – Improved spectral response delivers highly accurate readings for modern LED fixtures as well as HPS, MH, and sunlight.
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Rugged, grow-ready build – IP68-rated anodized aluminum sensor with acrylic diffuser and epoxy potting for use in humid rooms, greenhouses, and underwater environments.
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Advanced logging & DLI tracking – Spot, sample, and log modes let you map your garden, store up to 99 averages, and calculate daily light integral for precise light management.
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Professional stability & warranty – Less than 2% drift per year and a 4-year warranty provide reliable, repeatable measurements season after season.