Dave,
In our experience the specs on underwater lights run from conservative to liberal with a little snake oil too. Lumens are just one more unqualified specification. It makes it very hard to objectively compare alternate brands.
But here is what we do and have found that the results run consistent with our experience. Most LED underwater lights are going to run at a similar efficiency level. So, we compare the amperage draw. The light that draws more current is the brighter light.
David
Earmark Marine
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