I grow under full spectrum LED's (and also maintain planted aquariums) and you must get a light meter specifically for full spectrum LED's if that is your light source. The Apogee, at $500+, is very good in a very small set of choices.
I chose to use the Photon app for my iPhone, AND as others have said, let my plants tell me if the light is correct. Is an app at $7.00 as accurate as a $500 meter? Probably not, but as a hobbyist with a small collection, it's fine.
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