here are my aqua science bulbs in my 24" tek.
bulbs from left to right are:
17.5 k
15 k
uri actinic white for 12k
22 k
i would not get the 17.5 k again. i love the 22k and the 15k.
with the 22k you don't need a actinic bulb cause it is almost the same color and still produces some par.
Jason
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30g Display, 30g Sump, 24" 4 bulb tek light, Reefkeeper 2, Aqua C Urchin Skimmer, JBJ ATO , Tom Aqualifter Pump, 2 Koralia 1's, ECO Plus Lunar Nightlight, Eco 1056 submersible return pump routed through a SCWD
"Take your time. The only thing that happens fast in a reef tank is disasters."