John K Jordan
I've made similar but very casual measurements to compare my T5HO fixtures with some of my LED fixtures. I'm glad I installed the T5s. The light is incredible.
A longer-term and harder evaluation is the light reduction over time. I read where tests showed some LED elements lost a considerable amount of light output over a few years. This would never be noticed with the eye since it is so gradual.
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- Fluorescent vs LED- data from experiments