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Amazon.com: Digital Light Meters AP-8801A Lights Meter for Plants with 0.1~400,000 Lux Colorful Screen Light Meter Photography Meter with Temperature, Data Hold, Max/Min, Data Storage, Lux/FC Units : Electronics
PAR-355 Light PAR Meter Advanced Quantum Sensor Measure Grow Light Int – Gain Express
Amazon.com : Lux Light Meter for Photography Grow Plants Led Photometer Lighting Intensity Brightness Measurement Pocket Digital Photo Illuminance Sensor : Electronics
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Understanding Light – Using a Light Meter – House Plant Journal