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I'm doing something similar on my prop tanks which I keep crocea and SPS corals in at a depth of 24" (125 tank).
I'm using the 100 watt version of the lights with reflectors and also have some actenic lighting on them.
This setup has worked great for me and I really like the look of the tanks with 6500K lighting better then 10K-20K which always look to blue to my eye.
I've like the look so much that I put a few 65w (lower wattage) bulbs over my 265g reef just to improve the color. It had a mix of 2 10K bulbs and 2 20K bulbs previously. The 2 65w 6500K lights really made the tank look brighter but didn't really take away from the fluorescent look of the corals under the 20Ks. I'm really happy with the new balance of light in this tank also.
Oh using this style of PC bulb allows easy placement over the tank where you need it and costs a lot less then typical long fluorescent PC tubes sold in the hobby. The typical cost of PC has been one reason why many people have moved away from them as they are just to expensive to replace. With these bulbs you can use them in other parts of the house of flood lights. It's nice to recycle your bulbs and get additional use from them!
Carlo
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