Perhaps a little off topic, but may be of interest with respect to indoor growing. You can get "home automation" kits for pretty cheap as well that can control appliances with your computer (i.e. turning on/off grow lights automatically). I used to do this in my university dorm where I made a "party mode" with different lighting (after setting up the software, I ended up having to click one button and a black light, stereo, and laser light turned on). A friend also used this for hydroponic growing, controlling a water pump and lighting. Its really quite handy and not difficult to use (attached a usb/wireless device to your computer that sends signals to devices plugged into your normal electrical outlets...your appliances/lights are then plugged into these devices). With these you can get the lights to go on and off at precisely the same time each day (assuming you leave your computer on, of course).