Apogee Instruments
Apogee MQ-500 Full-Spectrum Quantum Meter
The handheld PAR meter I'd buy if I only bought one. Accurate under sunlight and every kind of LED, which is exactly where cheap sensors fall apart.
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Keep the lab in the light.
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Gear worth owning
A short list of things SKL would actually use, not a shopping catalog. If a better option exists, it goes here instead.
Reference light meters
The gold standard. A Garden Gnode estimates light cheaply; these measure it properly, and they're what SKL checks its own readings against.
Apogee Instruments
Apogee MQ-610 ePAR Meter (400–750 nm)
Extends the measurement into far-red, the light modern grow research says plants use more than the old 400–700 nm definition gives them credit for.
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Apogee DLI-500 Daily Light Integral Meter
Leave it by a plant and it totals the whole day's light, the number that actually predicts growth, rather than a single spot reading.
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Apogee SQ-520 Smart Quantum Sensor (USB)
For makers: a lab-grade PAR sensor that plugs into a computer. It's what you calibrate a DIY sensor against.
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Honestly, that helps just as much. Tell the lab what's confusing, broken, or missing.
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