Yeah, you can tell but it's not a huge difference. I'm mainly using the t5 for dawn/dusk. It's really cool because of the angle it actually has a horizon type effect.
Thats what I was thinking about doing to my tank too, use the t5 only for dawn to dusk, overlap it with the VHO 1/2 hours latter before kicking in my halides and then doing the oposite at dusk, this way my VHO can run 1 hour less each day.
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