Also stick to the CREE LEDs that are proven to work.
Ive seen a some info on the bridgelux the aquastyle guys use and you basically need twice as many if not more, to get the same output as the CREE which throws the power savings out the door. Some guy had a comparison on them, ill link it if I can find it again.
The PAR38 would actually work real well for that tank. Just make sure you get a quality one like nanotuners sells. Only issue is you cant dim for sunrise sunset and you cant customize it to your tank.
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