Definitely T5 - just find something in your price range and hopefully have better luck that what you got before. Sometimes more $$$ is worth it, sometimes not.
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After years and years of service life, I’ll rate them myself as excellent and cost effective.I don't think Sunblasters are rated for use over uncovered tanks.
I run Aquatic Life T5s (check out the hybrid unit, it will hold your XR15s too) but if I could do it all again I would go full on Sunpower with a ReefBrite add on.