those flourescent are not the same as led in spectrum not even close. they hare tri phosphor. only having 3 spikes 1 blue, 1 red, and 1 green all in the wrong places. they are not full spectrum at all. kelvin is no way measuring spectrum. its based on black body radiator temperature scale.
this is a typical 6500 k t5
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this is a 600k from cidly'
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see the difference. t5 kelvin bulbs doesn't cover shit where led does
here is an aquarium t5 spectrum not kelvin rated. flora sun
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the better the spectrum and more red they have the less they last. they start degrading after 6 months . they last 8 months to 1 year. so led in the long run is cheaper.