I'd get at least 6 T5HOs for an 18" deep tank if you want SPS.
The difficulty with general statements such as "can you do SPS with T5HO" is that there's a lot of variability with T5HOs. Maximizing PAR output would include:
- using individual gull-wing reflectors like Icecap SLRs
- overdriving them with, for example, Icecap 660 ballasts
- actively cooling them with fans
You won't get the same type of output with a standard Tek or Nova Extreme unit.
There's also bulb selection. With MH you've only got one bulb and one PAR reading coming out of that bulb. With a T5 unit you've got a myriad of options for bulb combos which can cause a lot of variability in PAR output.
As proven by numerous T5-lit tanks out there the short answer is "Yes" to the question, but don't expect your Oregon Tort to stay deep purple if all you've got is a two bulb Hagen Glo unit.
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