I am really new to saltwater aquarium keeping as well, but after only a week your tank is still cycling and most folks told me to keep my lights off. However, I also read a couple of articles that say turning your lights on for 8-10 hours a day will bring up pH (which drops at night in dark) but will also heighten the chances for an algae bloom.
I don't think the pH matters quite as much as the rest of the water parameters like ammonia (which you must introduce somehow in a fishless cycle to "feed" beneficial bacteria), nitrites and nitrates.
I too am doing a fishless cycle (almost finished 2nd week) using PURE household ammonia (goldex brand) that I bought at walmart for $2. I just add 1.0 - 3.0 ml per day to bring my test reading up to 4ppm. I will continue to do so until BOTH ammonia and nitrites read 0 and nitrates read 20+. Then will do a huge (60-90%) water change!
Once that is all said and done, I will then take a cup or so of my tank water to my LFS
for a final test by a pro before adding any real livestock. This being my first tank I cannot trust myself to read the tests successfully enough to jeopardize the clownfish I want to have.