Lore, all these fixtures simply plug into a 120V outlet. I have timers on all my lights, but the new T5H fixtures have on-off switches on the fixtures, so you can easily turn them on or off.
Lumens are simply a way to describe "brightness". The more lumens there are, the brighter the light. Sunlight will have variable lumens throughout the day, with the peak lumens being when the sun is directly overhead (this is far more complicated when considering the angle of the sun, but let's just keep this description simple).
Kelvin (K) shows the light spectrum or "hue" of the light. At the low and high ends you would have infrared (less than 2500K) and ultraviolet (more than 6500K [we'll eliminate x-ray to keep it simple]). Both infrared and ultraviolet are at the invisible ends, so the visible spectrums would be between those extremes. A 2500 K bulb would be considered a "warm" color (more yellow) and then as you increase the K, you would get into what's called "daylight" (5000K) and "full spectrum" (6000K). These terms are not scientific terms, just what manufacturers use. Go by the K number, not the term. Generally speaking, the full spectrum area is needed for plant growth and the warm spectrum for flowering. Again, this is very simplified. You wouldn't want to use bulbs that emit infrared, because the heat produced would burn the plants. Our sunburns are caused by infrared. You also would not want to use bulbs that emit (much) ultraviolet, because the UV can cause tissue changes in the plants and damage our eyes and skin. UV is what causes our skin cancer.
OK, wattage. Again, to keep it as simple as possible, the higher the wattage of a bulb the higher the lumens and with the typical incandescent bulb, the higher the wattage, the higher the K. Also the higher the wattage, the more electricity is used. That's one reason that fluorescent bulbs are less expensive to burn than incandescent bulbs. A fluorescent bulb might be 40W but produce the same lumens as a 200W incandescent bulb. More lumens but less wattage equals less electric bill to burn a fluorescent bulb.
Oh, I wish I knew more than I do so that I could describe all this in better terms. I am sorry, Lore. I am a dentist (past-tense) and not an electrical engineer.
I welcome anyone to jump right in and make this more clear.
