Hey,
How goes it buddy. I am a roofer. I have installed many of these type of skylights. The thought of using them to grow with has crossed my mind several times. You obviously know that you will have to rig up a device to cover the skylight lens for 12/12. My idea uses a servo (the same type of small motor that is used to control the wings on remote controlled planes) connected to a timer that opens a flap on the lens to effectively control your day night situation. If you want to flower in the summer you will have to eliminate the light for a portion of the day. The other thing you must consider is that it is not cheap or easy to install skylights, trust me, I have been doing this for over ten years. If you don't know what your doing then you will have leaks. I'll bet you all bud in my box, if you don't have roofing experience you will have leaks in your skylights. Look even if you have roofing experience, leaks are issues. The last thing I can say is that when you add the cost of the skylights (you will need more than one) and the cost of installation and the cost of rigging up some kind of automatic lens cover to regulate light your talking about a chunk of change. You can get a 1000w setup with bulb and ballast for like three bills online. Oh and if your not careful with where you put skylight you will generate a good deal of heat in your house. Most skylights actually have an opaque lens that eliminates most of light that comes through. Unchecked sunlight pouring into your house will generate a good deal of heat and you can't hook a fan up to the skylight to cool it off, like you can with an HID lamp. Just a few thoughts. You can totally make the skylights work you just have to be ready to deal with the issues.
Later