Yes to all your questions.
The lamps you chose are not the color temperature I would desire for cooking or reading. Your choice. The light would be a lot more yellow than the fluorescent lighting you had.
These lights I have sitting in front of me are for a Mexican solar home. It has fluorescent lighting. Sames issues, same decision to go LED. In order to get things right we are going to dry-run the lighting. Try with one panel per fixture then add one-by-one until the owner is satisfied. "Enough Lighting" is a totally subjective decision. But 12 panels, kidding aside would provide emergency operating room intense lighting. It would hurt your eyes. We are thinking 4 panels per fixture for overall 4X4 meter room size at a ceiling height of around 2.5 meters. Augmentation will come from spot specific LED lamps. The newer breed of LEDs are far brighter than the old dome lens 3.5 mm LEDs. We did not go with voltage regulated modules because they like to listen to ranchera music at night at wish no static. When the lights get noticeably dim its time for them to charge the batteries :)
