Hi Steve,
You are certainly getting a hell of a lot of light - much more than on the article I posted above. Are you overdriving it? You are getting more light than Mike Kirda measured with 2x400w Ushio bulbs.
Your readings at 6" are similar to calculated ocean values at 5 - 8 m depth near the equator, and your 24" readings are in the range of 9-15 m. Pretty decent.
My 24" readings are less than the light at 20 m.
The meter is a Quantum QMSS.
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